Question

which best describes the sex chromosomes in humans? a. males have two x chromosomes. b. males have two y chromosomes. c. females have one x and one y chromosome. d. males have two different chromosomes.

Explanation:

In humans, females have two X - chromosomes (XX), while males have one X and one Y - chromosome (XY). So males have two different chromosomes. Options A, B, and C are incorrect as males don't have two X or two Y chromosomes, and females don't have an X and a Y chromosome.

Answer:

D. Males have two different chromosomes.