In horses, black coat color is influenced by the dominant allele (B), and chestnut coat color is
influenced by the recessive allele (b). Trotting gait is due to a dominant gene (T), pacing gait to the
recessive allele (t). If a homozygous black trotter is crossed to a chestnut pacer,
(a) what will be the appearance of the F1 and F2 generations?
(b) which phenotype will be the most common?
(c) which genotype will be the most common?
(d) which of the potential offspring will be certain to breed true? What will be an ideal response?
(a) F1: black trotters; F2: 9 black trotters, 3 black pacers, 3 chestnut trotters, 1 chestnut pacer
(b) Black trotter
(c) Bb Tt
(d) bb tt, chestnut pacers
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