Blue-eyed mice interbreed and produce progeny with a 2: 1 ratio of blue to non-blue. when blue is crossed with nonblue, a 1: 1 ratio of the two classes is obtained. non-blues interbreeed to produce all non-blue offspring. explain these observations. support your explanation with details about phenotypes and genotypes.

Explanation:

The results are explained if the trait blue eyes is dominant (B) over non-blue (b) and the dominant allele B is lethal in homozygous individuals.

The possible genotypes and phenotypes are:

When blue (Bb) is crossed with non-blue (bb) the resulting offspring is 1/2 blue (Bb) and 1/2 non-blue (bb).

When non-blues interbreed (bb X bb) all progeny is non-blue (bb).