Question

select the two answers that are correct.
□ males have only one x chromosome, whereas females have two.
□ males have two x chromosomes, making them twice as likely to have the phenotype.
□ males have an x and a y chromosome, and females have two y chromosomes.
□ females have only one x chromosome, whereas males have two.
□ females have two x chromosomes, so one can mask the effects of the other.

Explanation:

• The first correct statement reflects typical human sex chromosome composition (males: XY; females: XX), meaning males have one X and females have two.
• The fifth correct statement describes X-chromosome inactivation or dominance: females can have a dominant X masking a recessive one, unlike males with only one X. The other options contain incorrect chromosome assignments (e.g., females having Y chromosomes, males having two Xs).

Answer:

A. Males have only one X chromosome, whereas females have two., E. Females have two X chromosomes, so one can mask the effects of the other.