First slide

Genetic Disorders

Question

In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree.

Moderate

A

Autosomal recessive
B

X-linked dominant
C

Autosomal dominant
D

X-linked recessive

Solution

It is a autosomal recessive trait. No crisscross inheritance is observed. Both males and females seem to possess the trait and so it is autosomal. Fourth member of generation III is affected although either of the parents are not hence it is recessive.

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