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 phenotypes of the F1 and F2 generations?
(b) Which phenotype will be the most common in the F2 generation?
(c) Which genotype will be the most common in the F2 generation?
(d) Which of the potential offspring will be certain to breed true? What will be an ideal response?
ANSWER: (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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