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?
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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