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In mice Y is the dominant allele for yel...

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

A

2 yellow : 1 grey

B

2 yellow : 1 grey

C

1 yellow : 1 grey

D

1 yelloe : 2 grey

Text Solution

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The correct Answer is:
B
Given that Y is dominant for yellow fur and y is recessive for grey fur, the cross between Yy and Yy 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).
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