Consider the following characteristics of a given pedigree W

Consider the following characteristics of a given pedigree. What mode of inheritance is most likely?

-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, 1/4 of the children are affected

A) Y-linked B)Autosomal recessive C) X-linked recessive D) X-linked dominant E)Autosomal dominant

Solution

Answer:

B)Autosomal recessive

A: unaffected (dominant)

a: affected (recessive)

Aa (unaffected) x Aa (unaffected)-------------Parents