Question

Which of the following is not a typical characteristic of human traits that follow an autosomal recessive inheritance pattern?

a. They often "skip" generations.
b. They appear equally in males and females.
c. Parents of affected children are often phenotypically normal themselves.
d. When affected individuals marry phenotypically normal individuals, their children are often phenotypically normal.
e. All of the above are characteristic of autosomal recessive inheritance.

Answer 1

b. They appear equally in males and females. The characteristic that is not typical of human traits following an autosomal recessive inheritance pattern is that they appear equally in males and females.

Step-by-step explanation:

The correct answer is b. They appear equally in males and females.

In an autosomal recessive inheritance pattern, the disorder is expressed when an individual has two copies of the recessive allele. Therefore, affected individuals will be homozygous recessive. This means that both males and females have an equal chance of inheriting and expressing the disorder.

The other characteristics listed in options a, c, and d are all typical of autosomal recessive inheritance. Autosomal recessive disorders often "skip" generations because carriers are phenotypically normal and the disorder may only be expressed when two carriers have a child and both pass on the recessive allele. Additionally, parents of affected children are often phenotypically normal themselves, as they may be carriers of the recessive allele without displaying symptoms. Finally, when affected individuals marry phenotypically normal individuals, their children are often phenotypically normal because the phenotypically normal parent is likely to be a carrier and there is a 50% chance of passing on the recessive allele.