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A guinea pig, heterozygous for both traits, mated with a homozygous recessive guinea pig. What is...

Question:

A guinea pig, heterozygous for both traits, mated with a homozygous recessive guinea pig. What is the probability of having offspring with at least one dominant trait?

a. 0.75

b. 0.00

c. 0.50

d. 1.0

e. 0.25

Independent Assortment:

The principle of independent assortment states that the members of a gene pair associated with one chromosome will assort independently of how the members of a gene pair associated with another chromosome will assort during meiosis. Thus, for an organism of genotype AaBb that is heterozygous in two different genes (a dihybrid), each of the following gamete genotypes is equally probable: AB, Ab, aB, and ab. One can observe this by doing a test cross with an individual that is homozygous recessive for both traits (of genotype aabb).

Answer and Explanation: 1

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First, determine the genotype of each parent:

  • Heterozygous parent: AaBb
  • Homozygous recessive parent: aabb

Then, determine what gamete genotypes are...

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Mendel's Second Law: The Law of Independent Assortment

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Chapter 18 / Lesson 4
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What is the law of independent assortment? Learn about Mendel's second law and law of segregation dihybrid cross. Understand Mendel's two laws regarding genetic traits.


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