Question

I need to breed all white mice for the genetics class visiting from a High School in a few weeks. I only have white males and black females. (Black is the dominant fur color) What would the genotype of the parent mice need to be to get the most white mice for my money? What genotypes would the

parents need to give only heterozygous offspring? Show each of these crosses (only heterozygous offspring, and maximum white offspring) on the Punnett squares below.

Answer 1

Punnet squares for maximum white mice are above, but H e t e r ozygous white mice aren't possible if black is dominant. Because black will be expressed, rather than white.

If white can be dominant and black can be recessive then h e t e r ozygous white mice are possible. (Punnet squares for this situation are also attached)