Question

A couple has four children, two boys and two girls. The father is affected by a single gene disorder but the mother is not. All four children are affected by the same disorder as the father. Which one of the following is NOT possible? (heterozygous and homozygous refer to the gene associated with the disorder) The allele that causes the disorder is dominant; the father is heterozygous and the mother is homozygous The allele that causes the disorder is dominant; the father is homozygous and the mother is homozygous The allele that causes the disorder is recessive; the father is homozygous and the mother is homozygous. The allele that causes the disorder is recessive; the father is homozygous and the mother is heterozygous

          A couple has four children, two boys and two girls.

The father is affected by a single gene disorder but the mother is not.

All four children are affected by the same disorder as the father.

Which one of the following is NOT possible?

(heterozygous and homozygous refer to the gene associated with the disorder)

The allele that causes the disorder is dominant; the father is heterozygous and the mother is homozygous
The allele that causes the disorder is dominant; the father is homozygous and the mother is homozygous
The allele that causes the disorder is recessive; the father is homozygous and the mother is homozygous.
The allele that causes the disorder is recessive; the father is homozygous and the mother is heterozygous

A couple has four children, two boys and two girls.

The father is affected by a single gene disorder but the mother is not.

All four children are affected by the same disorder as the father.

Which one of the following is NOT possible?

(heterozygous and homozygous refer to the gene associated with the disorder)

The allele that causes the disorder is dominant; the father is heterozygous and the mother is homozygous
The allele that causes the disorder is dominant; the father is homozygous and the mother is homozygous
The allele that causes the disorder is recessive; the father is homozygous and the mother is homozygous.
The allele that causes the disorder is recessive; the father is homozygous and the mother is heterozygous

Added by Lori H.

Question

Please give Ace some feedback