In horses, there are four alleles at the A locus. Arranged in dominance sequence, they are
A (wild), ab (bay), ac (brown), ad (black)
?
If you bred several bay mares whose sires were brown to a brown stallion whose sire was black, what are the genotypes of the parents; what type of offspring would be produced; and in what proportion?
?
A. aaad x acad; 1/2 brown, 1/2 black
B. abac x acad; 1/2 bay, 1/2 brown
C. Aab x acad; 1/2 bay, 1/2 wild
D. Aab x acad; all wild
E. adab x acad; all black
Answer: B
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