Most pedigrees showing the hypothetical human trait show the following characteristics:
• Males and females are equally affected.
• Two unaffected parents can have an affected child.
• In families in which the parents are unaffected but the children are affected, one-fourth of the children are affected.
What is the MOST likely mode of inheritance for this disorder?
A) autosomal recessive
B) autosomal dominant
C) X-linked recessive
D) X-linked dominant
E) Y-linked

Question

Most pedigrees showing the hypothetical human trait show the following characteristics: 
• Males and females are equally affected.
• Two unaffected parents can have an affected child.
• In families in which the parents are unaffected but the children are affected, one-fourth of the children are affected.
What is the MOST likely mode of inheritance for this disorder?
A) autosomal recessive
B) autosomal dominant
C) X-linked recessive
D) X-linked dominant
E) Y-linked

Quizplus · Accepted Answer

The characteristics described are consistent with an autosomal recessive inheritance pattern, where the trait can appear in both males and females equally, unaffected parents can have affected children, and approximately one-fourth of the children are affected if both parents are carriers.

Most Pedigrees Showing the Hypothetical Human Trait Show the Following