In horses, the Extension gene helps to determine coat color. The dominant trait (E) produces black pigment in the coat. The recessive trait (e) produces red pigment. Would a cross between a stallion who is homozygous, EE, and a mare who is heterozygous, Ee, ever produce a foal with a red coat?(1 point)
Responses
No, because there would have to be two recessive alleles for the foal to have a red coat.
No, because there would have to be two recessive alleles for the foal to have a red coat.
Yes, because the mare can pass on her recessive allele.
Yes, because the mare can pass on her recessive allele.
No, because the mare cannot pass on her recessive allele.
No, because the mare cannot pass on her recessive allele.
Yes, because the stallion's dominant allele and the mare's recessive allele can result in a red coat.
No, because there would have to be two recessive alleles for the foal to have a red coat.
Yes, because the stallion's dominant allele and the mare's recessive allele can result in a red coat.
The correct answer is: No, because there would have to be two recessive alleles for the foal to have a red coat.
To understand why this is the correct answer, let's break down the coat color inheritance in horses. In this case, we are looking at the Extension gene, which determines whether the horse will have a black or red coat. The dominant allele (E) produces black pigment, while the recessive allele (e) produces red pigment.
The stallion in this cross is homozygous for the dominant allele, EE, which means that he can only pass on the dominant allele to his offspring. The mare, on the other hand, is heterozygous, Ee, which means she has one dominant allele and one recessive allele.
When these two horses are crossed, each parent randomly passes on one of their alleles to the foal. Since the stallion only has dominant alleles, he will always pass on an E allele. The mare, however, has a 50% chance of passing on either the dominant allele (E) or the recessive allele (e).
In order for the foal to have a red coat, it would need to inherit two recessive alleles (ee) from both parents. However, since the stallion only passes on the dominant allele, it is not possible for the foal to receive two recessive alleles and have a red coat. Therefore, the correct answer is that a cross between a homozygous dominant stallion and a heterozygous mare would not produce a foal with a red coat.