Question

The horse breeder uses Punnett squares to plan matings. When crossing a homozygous black stallion (BB) with a heterozygous black mare (Bb), what does the Punnett square predict for their foal's coat color?
Question 5 options:

25% black foals and 75% brown foals from this combination

50% black foals and 50% brown foals with equal probability

100% black foals, with 50% BB and 50% Bb genotypes

All foals will be brown because the mare carries a recessive allele

Answer 1

100% black foals, with 50% BB and 50% Bb genotypes.

Punnett square: parents BB × Bb → offspring genotypes are BB and Bb (each 50%), and B is dominant so all foals are black.