The Punnett square predicts offspring genotypes and phenotypes for a dihybrid cross. The resulting phenotypic ratio would be 1:1:1:1 for black trotters, black pacers, chestnut trotters, and chestnut pacers.
Punnett Square:
When mating a homozygous black pacer (BBtt) with a homozygous chestnut, heterozygous trotter (bbTt), the offspring's genotypes will be BbTt (black trotters), Bbtt (black pacers), bbTt (chestnut trotters), and bbtt (chestnut pacers) in a 1:1:1:1 ratio. Phenotypic ratio: 1 black trotter : 1 black pacer : 1 chestnut trotter : 1 chestnut pacer.
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