Question

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 × Yy will be ______.

Options

• 3 yellow : 1 grey

• 2 yellow : 1 grey

• 1 yellow : 1 grey

• 1 yellow : 2 grey

Answer 1

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 × Yy will be 2 yellow : 1 grey.