Question 15 · Genética UAB 2022

Question 15 (Dihybrid cross with lethal alleles)

In mice ( Mus musculus), a dominant allele at one locus produces yellow coat color and is lethal when homozygous, whereas the wild-type allele produces agouti color. At an independently assorting locus, a dominant allele results in a short tail and is also embryonic lethal when homozygous, whereas the recessive allele produces normal-length tails. If two mice with yellow coats and short tails are mated, what fraction of their viable progeny will display both yellow coats and short tails?