In poultry, a gene C produces creeper (very short legs) in the heterozygous condition and lethal...
Question:
In poultry, a gene C produces creeper (very short legs) in the heterozygous condition and lethal in the homozygous condition. The c allele of the gene produces normal legs in the homozygous condition. Barring is due to a dominant sex-linked gene, B, and non-barred to its recessive allele, b.
In chickens, males are ZZ and females are ZW and the barriage gene is on the Z chromosomes. If a creeper male homozygous for barring is mated with a creeper female who is non-barred, what is the probability of an offspring being a normal barred female?
Sex-Linked Genes:
Sex-linked genes are found on one of the two sex chromosomes. In humans, these are the X and Y chromosomes, but in chickens, these are the Z and W chromosomes. Since female chickens only have one Z chromosome, they will express Z-linked recessive traits even if only one copy of the recessive allele is present. The same applies for males and X-linked recessive traits in humans.
Answer and Explanation: 1
Become a Study.com member to unlock this answer! Create your account
View this answerThe first parent is a creeper male who is homozygous for the dominant sex-linked barring allele. This male must have the genotype...
See full answer below.
Ask a question
Our experts can answer your tough homework and study questions.
Ask a question Ask a questionSearch Answers
Learn more about this topic:
Get access to this video and our entire Q&A library
Punnett Square | Definition & Overview
from
Chapter 18 / Lesson 4
364K
Learn the definition of the Punnett square and how it's used to determine the potential genotype and phenotype of offspring. View Punnett square examples to aid understanding.
Related to this Question
- In chickens, the creeper trait is a semi-lethal dominant allele that results in shortened legs, so that the chickens must creep along. Creepers are heterozygous for the allele. Yet, in the homozygous state, the allele is lethal and embryos do not develop
- In chickens, congenital baldness is due to a Z-linked recessive gene. A bald rooster is mated with a normal hen. The F1 from this cross are interbred to produce the F2. Give the phenotypes and genotypes, along with their expected proportions, among the F1
- In poultry, the dominant alleles for rose comb (R) and pea comb (P), if present together, give walnut comb. The recessive alleles of each gene, when present together in a homozygous state, give a single comb. Give the phenotypic ratios for the progeny of
- In chickens, congenital baldness is due to a Z-linked recessive gene. A bald rooster is mated with a normal hen. The F_1 from this cross are interbred to produce the F_2
- mutant sex-linked trait called 'notched' (N) is deadly in Drosophila when homozygous in females. Males who have a single N allele will also die. The heterozygous condition (Nn) causes small notches on the wing. The normal condition in both male and female
- In chickens, a dominant sex-linked gene (B) produces barred feathers, and the recessive allele (b), when homozygous, produces nonbarred (solid-color) feathers. Suppose a nonbarred cock is crossed with a barred hen.
- Pigment of chicken feathers is regulated by two genes, the gene for feather pigment C, and a gene that inhibits pigment production, I. A mother chicken, who is homozygous dominant for gene C, and heterozygous for gene I, is crossed with a father chicken,
- Pigment of chicken feathers is regulated by two genes, the gene for feather pigment (C) and a gene that inhibits pigment production (I). A mother chicken, who is homozygous recessive for gene c, and heterozygous for gene I, is crossed with a father chicke
- Pigment of chicken feathers is regulated by two genes, the gene for feather pigment (C) and the gene that inhibits pigment production (I). A mother chicken, who is homozygous recessive for gene c, and heterozygous for gene I, is crossed with a father chic
- Pigment of chicken feathers is regulated by two genes, the gene for feather pigment (C) and a gene that inhibits pigment production (I). A mother chicken, who is known to be homozygous recessive for gene c, and heterozygous for gene I, is crossed with a f
- A mutant sex-linked trait called 'notched' (N) is deadly in Drosophila when homozygous in females. Males who have a single N allele will also die. The heterozygous condition (Nn) causes small notches on the wing. The normal condition in both male and fema
- Microphthalmia is a condition that causes chickens to have very small eyes, but it only appears in hens. The condition is autosomal recessive. Microphthalmia is sex-influenced and not sex-limited because: a) it is recessive in males and dominant in femal
- Pigment of chicken feathers is regulated by two genes, the gene for feather pigment (C) and the gene that inhibits pigment production (I). A mother chicken, who is known to be homozygous recessive for gene c, and heterozygous for gene I, is crossed with a
- In a certain breed of domestic fowl, a super comb is dominant to single comb but feather color shows an absence of dominance. Black legs and white legs are homozygous, whereas the heterozygote gives red legs. From crosses between birds heterozygous for bo
- Suppose heterozygous (Bb) butterflies can express a condition in which the tops of their wings are square, and not round like normal (normal is bb). The dominant B allele is lethal when homozygous. Two alleles that are independently sorting determine purp
- A species of fly has two alleles for the length of their legs. The allele for long legs is dominant and is represented by p. The allele for short legs is recessive and is represented by q. If 33 of 100 organisms have short legs, what is p?
- In Manx cats, the alleles "TT" yield a cat with a normal long tail, the alleles "Tt" yield a cat with a short or absent tail and the alleles "tt" are lethal to the embryo. Predict the genotype and phenotype of potential kittens resulting from the mating o
- In Drosophila, the gene for bar-shaped (B) eyes and the gene for scalloped wings (sc) are linked on the X-chromosome. (The normal or wild type eye shape is oval, and the wild type wing is rounded.) Heterozygous, bar-eyed females were mated to homozygous,
- Pigeons have two alleles of a single gene that determines whether they have feathers on their lower legs. The alleles are called no grouse (associated with the featherless phenotype) and grouse (assoc
- The Manx phenotype in cats (results in short tail) is a semi-lethal trait similar to the creeper phenotype in chickens. Embryos homozygous for the Manx allele do not develop and are not observed as kittens. A male Manx cat and a female Manx cat produce ki
- In chicken males, genes on the Z chromosome are: 1. heterogametic. 2. hemizygous. 3. homozygous. 4. homogametic. 5. heterozygous.
- A testcross is used to determine the genotype of a plant showing the dominant tall trait. Which of the following probably shows that the plant is heterozygous? a. all the offspring show the dominant trait b. all the offspring show the recessive trait c. s
- In Andalusian fowl, the plumage for black feathers and the plumage for white feathers are codominant, the heterozygous condition resulting in mottled plumage. A mottled hen is bred with a white rooster. a. Predict the genotypic and phenotypic ratio of th
- The allele that produces miniature wings (n) in fruit flies is recessive to the allele that produces normal wings (N). When a female who is a carrier for miniature wings is crossed with a male that has normal wings, half of the male offspring and none of
- In poultry, rose comb is controlled by a dominant allele, and its recessive allele controls single comb. Crossing a pure-breeding rose comb chicken with a pure-breeding single comb chicken would produce which of the following? a. All Rr rose b. All Rr, si
- In poultry, rose comb is controlled by a dominant allele, and its recessive allele controls a single comb. Crossing a pure-breeding rose comb chicken with a pure-breeding single comb chicken would produce which of the following? a. All Rr rose b. All Rr
- Hemophilia is the inability of the blood to properly form clots. It is inherited as a recessive allele on /the X chromosomes. A man with a normal phenotype marries a woman who is a carrier for the hemophilia allele (she has a normal phenotype but is heter
- In flower beetles, pygmy (py) is recessive to normal size (py+), and red color (r) is recessive to brown (r+). A beetle heterozygous for these characteristics was test crossed to a beetle homozygous for pygmy and red. The following are progeny phenotypes
- In cats, short fur is most prevalent over long fur. a. Which allele is dominant? b. Which allele is recessive? c. What would be the genotype of a homozygous short-fur cat? d. What would be the genotype of a homozygous long-fur cat? e. What would be the ge
- In chickens, black feather color and white feather color equally express. Both feather colors show up in the heterozygous offspring and result in a checkered pattern. Presence of hair on legs is also a trait studied in chickens. Clean leg is dominant to h
- Hemophilia is the inability of the blood to properly form clots. It is inherited as a recessive allele on the X chromosome. A man with a normal phenotype marries a woman who is a carrier for the hemophilia allele (she has a normal phenotype but is heteroz
- Hemophilia (a blood clotting disorder) is determined by an X-linked recessive gene (alleles are H and h). Brachydactyly (abnormally short digits) is caused by an autosomal gene (allele is B). A man who has hemophilia and normal digits is married to a woma
- In pigs, an allele that produces a white belt around the animal's body (W) is dominant over its allele for a uniformly colored body (w). The dominant allele of another gene (F) produces fusion of the two hoofs on each foot. Suppose a uniformly-colored sow
- Suppose that the short allele is a meiotic drive gene, and 80% of the gametes from a heterozygous individual with tall and short alleles contain short alleles. If tall is dominant to short, what percent of individuals from a cross between a heterozygous t
- A heterozygous individual who can pass on an allele for a genetic disorder but does not express any of the characteristics for having the disorder is called a) A carrier b) Recessive c) Dominant d) Unaffected e) A pedigree
- In some cats, the gene for tail length shows incomplete dominance. Cats with long tails are homozygous dominant (TT) and cats with no tails are homozygous recessive (tt). Heterozygous cats have short tails (Tt). For each of the following construct a Punne
- For comb shape in chickens, rose (A) is dominant over nonrose (a). Pea (B) is dominant over nonpea (b). Dominants for rose and pea produce a walnut comb. Homozygous for rose and pea produces a single comb. This describes: A. epistasis B. polygenic C. plei
- 1) In peas, tall (T) is dominant over the allele for short (t). What would you expect in the F1 generation if you crossed a homozygous tall plant with a short plant? Why? 2) In peas, tall (T) is dominant over the allele for short (t), and smooth(S) seed
- Two long winged flies were mated and the offspring included 77 with long wings and 24 with short wings. a. Is the short winged condition dominant or recessive? b. What are the genotypes of the parents
- In peas, tall (T) is dominant over the allele for short (t), and smooth(S) seed is dominant over the allele for wrinkled(s) pea seeds. What would you expect in the F_1 generation if you crossed a homozygous tall, wrinkled seed plant with a short, homozygo
- Hemophilia A, a condition in which blood does not clot properly, is a recessive trait located on the X chromosome. A woman heterozygous for the trait marries a normal male. What is the probability that this couple will have hemophiliac daughters? What is
- Three pairs of genes with two alleles each (A1 and A2, B1 and B2, and C1 and C2) control the height of a plant. Suppose that the 1 allele is dominant in each case and the 2 allele is recessive. Under this revised scheme, the dominant phenotype contributes
- Hemophilia is a genetic disorder in which the blood fails to clot properly. This disease is the result of a sex-linked recessive trait located on the X chromosome. Write down the possible genotypes for each of the following phenotypes.\\a. Normal female \
- If a male bird that is heterozygous for a recessive Z-linked mutation is crossed to a wild-type female, what proportion of the progeny will be mutant males?
- The phenotype of vestigial (short) wings (vg) in Drosophila melonogaster is caused by a recessive mutant gene that independently assorts with a recessive gene for hairy (h) body. Assume that a cross is made between a fly with normal wings and a hairy body
- In Drosophila, the brown eye mutant allele (bw) is autosomal and is recessive to the wild type allele (bw+). True breeding wild type flies are crossed to true-breeding brown-eyed flies. a) What is the genotype and the phenotype of the F1 flies? b) If the
- Feather color in a certain species of bird is controlled by a pair of alleles that exhibit incomplete dominance. If birds that are homozygous for one allele are black and birds that are homozygous for the other allele are white, then heterozygous birds wo
- If T = tall and t = short, the genotype of an animal with the "short" phenotype must be a. Tt. b. TT. c. tt. d. T.
- Crosses between two ducks with spread-out tail phenotype always produce ducklings with spread-out, normal, and pointy tails in a 2:1:1 ratio. If the tail shape phenotype is controlled by a single locus, what is the expected phenotypic ratio in the progeny
- 1) In peas, tall (T) is dominant over the allele for short (t). What would you expect in the F1 generation if you crossed a homozygous tall plant with a short plant? Why? 2) In peas, tall (T) is domi
- In cats, the allele (S) for short fur is dominant to the allele(s) for long fur. In an Ss genotype, which allele is expressed in the phenotype?
- The dominant C allele of a gene that controls color in corn produces kernels with color; plants homozygous for a recessive c allele of this gene have colorless or white kernels. If a CC plant and a Cc plant were crossed, what would be the expected phenoty
- whyIn peas, tall (T) is dominant over the allele for short (t), and smooth (S) seed is dominant over the allele for wrinkled(s) pea seeds. What would you expect in the F1 generation if you crossed homozygous tall, wrinkled seed plant with a short, homozyg
- You are studying a gene that controls ossicone (horn) length in giraffes. The wild-type long-ossicone allele (L) is dominant to the mutant short-ossicone (l) allele. However, the L allele is only 60% penetrant. You cross two heterozygous giraffes. What pr
- In some cats the gene for tail length shows incomplete dominance. Cats with long tails and cats with no tails are homozygous for their respective alleles. Cats with one long tail allele and one no tai
- In peas, tall (T) is dominant over the allele for short (t). What would you expect in the F_1 generation if you crossed a homozygous tall plant with a short plant? Why?
- A gene produces very short fingers and toes (a condition called brachydactyly). Another allele of this gene produces normal length fingers and toes. The short finger-toe allele (B) is incompletely dominant to the normal finger-toe allele (B'). A homozygou
- Use a Punnett square to predict the offspring in a cross between a dwarf pea plant (homozygous recessive) and a tall pea plant (heterozygous). What is the phenotypic ratio of the offspring?
- A cross between homozygous red-eyed flies and homozygous white-eyed flies results in progeny that all have red-eyes. This result demonstrates A. a dihybrid cross. B. the norm of reaction. C. the blending model of genetics. D. the law of independent assort
- Sex-linked genes exhibit unique patterns of inheritance. Assuming there is one X-linked recessive trait that can cause a disorder in people. If the mother is the carrier (X^BX^b)and the father is normal (XBY) (Note: B is the dominant allele; b is the rece
- Long hair (L) is dominant over short hair (l) in a particular breed of cat. Show the cross between a homozygous dominant long haired cat with a homozygous recessive short haired cat. What is the genotype and phenotype of the offspring?
- A population of birds is in Hardy-Weinberg (genetic) equilibrium. 20 percent of the birds have short tail feathers, which is a recessive trait. Determine the genotype and allele frequencies of the population.
- In Drosophila the brown eye mutant allele (bw) is autosomal and is recessive to the wild type (bw'). True breeding, wild type flies are crossed to true-breeding brown-eyed flies. a. What is the genotype and phenotype of the F1 flies? b. If the F1 flies ar
- In cats, the allele (S) for short fur is dominant to the allele(s) for long fur. Which of the fo1lowing genotypes is (i) heterozygous (ii)homozygous dominant? SS, Ss, s
- You have identified an interesting mutant in gene P. Using a Punnett square, demonstrate the cross you can perform to determine if it is a dominant or recessive mutation compared to the wild type. Write the expected ratios for either scenario.
- A of a disorder has a heterozygous genotype and a dominant, normal phenotype.
- In certain pea plants, the allele T for tallness is dominant over t for shortness. \\ a. If a homozygous tall and a homozygous short plant are crossed, what will be the phenotypes and genotypes of the offspring? \\b. If both individuals are heterozygous,
- Complete a new Punnett Square below, for a woman who is a carrier of sickle cell, who is married to a man who has normal hemoglobin and is homozygous. A carrier for a recessive trait has a heterozygous genotype that "carries" the recessive allele without
- In pea plants, the gene for height has two alleles: tall (T) and short (t). If a homozygous recessive pea plant is crossed with a heterozygous pea plant, what ratio of dominant to recessive phenotypes should occur in the offspring? \\ 4:1 \\ 1:1 \\
- Scalloped (sd) wing is an x-linked recessive and ebony (e) body color is an autosomal recessive mutation in Drosophila. What proportion of scalloped, normal body colored males is expected in the F2 starting with a true breeding scalloped female which is w
- Huntingon's Disease is caused by a dominant allele. Roger is homozygous for Huntington's and has cystic fibrosis. Elvira is homozygous normal for Huntington's but is a carrier of cystic fibrosis. Cystic fibrosis is inherited via a recessive allele. What a
- A gene controlling plant height has T (tall) and t (short) alleles. If a plant that has the genotype Tt is self-fertilized, what percentage of its progeny will be tall?
- Hemophilia-A in humans is caused by an X-linked recessive gene. Assume a hemophiliac male mates with a homozygous nonhemophiliac female. If a daughter produced by the mating above mates with a normal male, what expected proportions and sexes among their o
- The chestnut coat color of horses is due to a recessive gene, while the dominant allele (B) results in black. The pacing gait is due to a recessive gene, whereas the dominant allele (T) results in the trotting gait. Show the offsprings that could result f
- A homozygous tall, green-flowered plant is crossed with a homozygous short white-flowered plant. Tall and green are dominant. a. Make a Punnett square and gametes. b. Complete the cross and determine possible offspring. c. Determine genotypic and phenotyp
- A phenotype ratio of 9:3:3:1 in the offspring of a mating of two organisms heterozygous for two traits is expected when _____. a. only recessive traits are scored. b. incomplete dominance for the two traits. c. the gene pairs assort independently during m
- In cats, the allele (S) for short fur is dominant to the allele (s) for long hair. In an Ss genotype, which allele is expressed in the phenotype?
- In Netherlands dwarf rabbits, a gene showing intermediate inheritance produces three phenotypes. Rabbits that are homozygous for one allele are small rabbits; individuals homozygous for the other allele are deformed and die; heterozygous individuals are d
- When two sets of genes are considered simultaneously, we call the genotype a dihybrid. To become familiar with this concept, write genotypes for each pea plant described below. (Tall and red genes dominate short and white ones.) Each trait is represented
- Both the loci for red eyes and normal wings are located on the same chromosome within Drosophila. Using a standard dihybrid test cross design, you produce a heterozygous F1 female by crossing a homozygous female for red-eye, normal wing (RR DD) against a
- Codominance: In some breeds of chickens, black feathers and white feathers are both dominant genes and heterozygous individuals appear checkered with black and white feathers. If a checkered is crossed with a white-feathered chicken, what are the possible
- In cats, short fur (L) is a completely dominant trait; long fur (l) is recessive. You are breeding cats and you want to see if your short-haired cat is homozygous dominant or heterozygous for the gene that determines the length of its fur. What would be t
- In cats, the allele (S) for short fur is dominant to the allele(s) for long fur. What is the phenotype of a cat with the genotype Ss?
- In chickens, black feathers (B) are dominant over white feathers (b). The sex ratio of chickens is 50:50. If two offspring result from the cross between a heterozygous hen and a heterozygous rooster, what is the probability both chicks will have the same
- You have identified an interesting mutant in gene P. Using a Punnett square, demonstrate the cross you perform to determine if it is a dominant or recessive mutation compared to the WT gene P allele. Write the expected ratios for either scenario.
- In a dihybrid cross between RrTt and RRtt, what are the genotype and phenotype ratios of the offspring, assuming R and T are dominant? R codes for round seed, while r codes for wrinkled seed. T codes for tall height, while t codes for short height.
- In a dihybrid cross between RrTt and RRtt, what are the genotype and phenotype ratios of the offspring, assuming R and T are dominant? R codes for round seed, while r codes for wrinkled seed. T codes for tall height, while t codes for short height. Show y
- In a dihybrid cross between RrTt and RRtt, what are the genotype and phenotype ratios of the offspring, assuming R and T are dominant? R codes for round seed, while r codes for wrinkled seed. T codes for tall height, while t codes for short height. Sho
- If one cat carries long haired traits (Ss) and its mate carries homozygous short haired traits (ss). Use a Punnett Square to determine the probability of one offspring having long hair.
- Select the correct answer. A muskrat exhibits a standard complete dominance pattern for fur colour, with the dominant W allele and recessive w allele. Assuming the parental generation was composed of true- breeding homozygotes, what is the probability tha
- The Manx cat has a very short or no tail due to a dominant trait T. Cats who inherit one dominant (T) and one recessive (t) allele will be tailless (Manx); cats who are homozygous recessive will have normal, long tails. However, the homozygous dominant co
- In hogs, an allele that produces a white belt around the animal's body (W) is dominant over its allele for a uniformly colored body (w). The dominant allele of another gene (F) produces a fusion of the two hoofs on each foot. Suppose a uniformly-colored h
- You are a farmer, and you breed a black chicken with a white chicken, and all of the F1 generation are grey. What type of inheritance is this? What will be the phenotypic ratio of the F2 generation?
- Which would be easier to get rid of in a flock of chickens, a recessive allele for erect combs or a dominant allele for feathered legs? How many generations would it take?
- In a recessive disorder, individuals who have that recessive allele but not the disorder are referred to as: A. Autosomal. B. Codominant. C. Phenotypes. D Genotypes. E. Carriers.
- A homozygous tall (dominant) pea plant is crossed with a short (recessive) plant. The probability that an F1 plant will be tall is a. 50%. b. 25%. c. 75%. d. 100%.
- A homozygous tall (dominant) pea plant is crossed with a short (recessive) plant. The probability that an F_1 plant will be tall is ____. A. 100%. B. 25%. C. 75%. D. 50%.
- In the case of complete dominance, the law of independent assortment for a standard dihybrid cross produces the following phenotype ratio: a) 7:1:1:7 b) 1:2:1 c) 3:1 d) 9:3:3:1
- Two plants are crossed and the resulting progeny plants display a 1:1 ratio for tall and short plants. The T allele is dominant and makes the plant tall. The t allele is recessive and makes the plant short. 1) What were the genotypes of the two parents? a
Explore our homework questions and answers library
Browse
by subject