Question

Given below is a pedigree chart showing the inheritance of a certain sex-linked trait in humans. What is the trait traced in the below pedigree chart ?

• A. Dominant X-linked
• B. Recessive X- linked
• C. Dominant Y-linked
• D. Recessive Y- linked

Answer 1

The correct option is C Dominant Y-linked

The pedigree is showing that in generation 1, the male is affected and the female is unaffected.

In generation 2, the females are affected and the males are unaffected. This means the female in generation 1 was a carrier for a particular trait.

In generation 3, both males and females are affected.

From this information, it can be predicted that the trait is Dominant X-linked because it is appearing in both males and females and occurring in every generation.

So, the correct answer is 'Dominant X-linked'.