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  • In mice , Y is the dominant allele for yellow fur and y is the resessive allele for grey fur. Since Y is lethal when homozygous , the result of cross Yy x Yy will be<div class='qna-option'

In mice , Y is the dominant allele for yellow fur and y is the resessive allele for grey fur. Since Y is lethal when homozygous , the result of cross Yy x Yy will be

Option: 1

3 yellow : 1 grey


Option: 2

2 yellow : 1 grey


Option: 3

1 yellow : 1 grey


Option: 4

1 yellow : 2 grey


Answers (1)

best_answer

As we learnt ,

 

Result of cross in F2 -

When F1 was self pollinated, F2 resulted in the following ratio:

1(RR) : 2(Rr) : 1 (rr)

- wherein

The genotype ratio is as expected by the phenotype ratio from 3:1 changed.

 

 Given , that Y is dominant for yellow fur and y is recessive for grey fur , the cross between Yy and Yy will will produce ratio of 1 YY : 2 Yy : 1 yy . But as Y is lethal in homozygous condition , hence phenotypic ratio would be 2 yellow (Yy) : 1 grey (yy) .

 

Posted by

SANGALDEEP SINGH

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