Question

106
36. 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 x Yy will be
(a) 3 yellow : 1 grey (b) 2 yellow : 1 grey
(c) 1 yellow : 1 grey (d) 1 yellow 2 grey.
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Answer 1

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Answer...

On crossing

Yy x Yy

progenies will be

YY , Yy , Yy , yy

since YY is lethal , this progeny will not survive

so, Yy , Yy , yy will be left

Answer - b)

hope helps !!