Question

The trait shown below is expressed only in males in the family. What is the BEST explanation for the inheritance of this trait?

a) Autosomal dominant inheritance

b) X-linked recessive inheritance

c) Y-linked inheritance

d) Mitochondrial inheritance

Answer 1

X-linked recessive inheritance is the best explanation for the inheritance of the trait expressed only in males in the family.

Step-by-step explanation:

The BEST explanation for the inheritance of the trait expressed only in males in the family is X-linked recessive inheritance.

This means that the gene responsible for the trait is located on the X chromosome. Since males have only one X chromosome, any gene on it will be expressed, regardless of whether it is recessive or dominant. Females, on the other hand, have two X chromosomes, so the gene must be present on both copies for the trait to be expressed.