Question

question 4 of 10
what kind of trait is illustrated in the diagram?
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a. sex - linked recessive
b. autosomal dominant
c. sex - linked dominant
d. autosomal recessive

Explanation:

Step1: Analyze autosomal dominant

In autosomal dominant, if a parent is affected, there is a high chance of offspring being affected. But here, the pattern doesn't match autosomal dominant (e.g., not all children of affected parent show typical autosomal dominant inheritance).

Step2: Analyze autosomal recessive

In autosomal recessive, usually two carriers (or affected) parents are needed for a higher chance of affected offspring. The pattern here is more in line with sex - linked.

Step3: Analyze sex - linked dominant

In sex - linked dominant, a male (if affected) would pass the trait to all daughters (but not all daughters are affected here).

Step4: Analyze sex - linked recessive

In sex - linked recessive:

• Males (XY) can be affected (as they have only one X).
• Females (XX) can be carriers (one normal X and one affected X).
• Sons can inherit the affected X from carrier mothers. The pedigree shows males affected and females as carriers, which is consistent with sex - linked recessive.

Answer:

A. Sex - linked recessive