Question

Suppose that you had a male mouse with black eyes and a female mouse with red eyes. You know that the allele for black eyes is dominant, and you want to determine whether the male is heterozygous.

To do so, you would do a
. Breed
them and look for approximately a
ratio of black eyes to red eyes.

Answer 1

To do so, you would do a test cross. Breed them and look for approximately a 1:1 ratio of black eyes to red eyes.