Question

in horses, black hair color is dominant to chestnut hair color. if the black horse is homozygous, what is its genotype? bb bb bb

Explanation:

Step1: Recall Dominant/Recessive Genotypes

Dominant traits (black) can be homozygous dominant (two dominant alleles) or heterozygous (one dominant, one recessive). Recessive (chestnut) is homozygous recessive (two recessive alleles). Let dominant allele = \( B \), recessive = \( b \).

Step2: Determine Homozygous Dominant Genotype

A homozygous black horse has two identical dominant alleles. So genotype is \( BB \) (homozygous dominant), while \( Bb \) is heterozygous, \( bb \) is homozygous recessive (chestnut).

Answer:

A. BB (assuming the option with BB is the correct choice here, as per the genetic principles of dominant homozygous genotype for a dominant trait like black hair in horses)