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In peas, the allele for tall plant (T) is dominant to the allele for short plants and the allele...

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In peas, the allele for tall plant {eq}\rm (T) {/eq} is dominant to the allele for short plants and the allele for purple flowers {eq}\rm (P) {/eq} is dominant to white flowers {eq}\rm (p) {/eq}. Write out the results of the following crosses and determine the phenotypic ratios for each:

(a) {eq}\rm TtPp \times TtPp {/eq}.

(b) {eq}\rm Ttpp \times ttpp {/eq}.

(c) {eq}\rm ttPp \times Ttpp {/eq}.

(d) {eq}\rm TTpp \times ttPP {/eq}.

9:3:3:1 ratio:

The 9:3:3:1 ratio is the combined phenotypic ratio of two genes that assort independently; it allows predicting the number of individuals of each phenotype expected from the cross between dihybrid individuals. This ratio emerges from the multiplication product of (3:1) X (3:1) = 9:3 plus 3:1.

Answer and Explanation: 1

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a) Tt Pp X Tt Pp

This is a typical dihybrid cross for which we can apply Mendel's Second Law to deduce the phenotypes of the descendants. T/t and...

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Mendel's Second Law & Its Application

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Chapter 17 / Lesson 4
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In this lesson, we'll explore how genes can assort independently according to Mendel's second law. We'll also use Punnett squares to see whether or not genes are linked and how this relates to research.


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