In horses, the allele for a black coat (b) is dominant over the allele for a brown coat (b). a cross between a black horse and a brown horse produces a brown foal. is the black horse a homozygous or heterozygous for coat color? bb x bb or bb x bb

Bb X bb

Explanation:

It is given that the allele B for the black coat is dominant over allele b for a brown coat.A dominant allele always leads to the expression of the dominant trait in the heterozygous condition. When a black and brown horse is crossed as given in the question and the result is a brown foal, then the genotype of the brown foal must be bb as the brown coat is a recessive trait. Since each parent contributes one allele each for a given gene, the black horse must have b allele, and hence must be heterozygous Bb.The cross is shown in the punnett square.