Question

Traits controlled by genes on the X chromosome are called sex-linked traits. In what individuals are recessive sex-linked traits more commonly expressed?

Question 16 options:

males because they have a Y chromosome

females because they have two X chromosomes

children who later outgrow conditions brought on by the traits

males because they have only one X chromosome

Answer 1

males because they have only one X chromosome

Step-by-step explanation:

In humans, certain hereditary defects determined by recessive genes are linked to the X chromosome. Such defects are more common in males than females. This is because any recessive gene located on the chromosome X Must be expressed phenotypically in the males.

Answer 2

The correct option is D) males because they have only one X chromosome

Step-by-step explanation:

Females have two X chromosomes while males have one X chromosome and one Y chromosome.

For females, the X- linked trait either has to be dominant and have two alleles to be expressed or it should be recessive with both the alleles carrying the recessive type for the trait to occur.

However, in males, only one allele for any trait will be able to cause the trait as males have only one X chromosome. Hence, sex-linked recessive traits will be more commonly expressed in males than females.