If black hair (A) is dominant over chestnut hair (a), can two sheep with chestnut hair produce an offspring with black hair? Explain your answer.

Answer:

No, two sheep with chestnut hair cannot produce an offspring with black hair. Because chestnut hair is a recessive trait, both parents must be homozygous recessive (aa). Since neither parent carries the dominant allele for black hair (A), they can only pass the chestnut allele to their offspring, resulting in 100% chestnut-haired offspring.