Question

question 7 of 10
how do fraternal twins form?
a. eggs are fertilized in different menstrual cycles.
b. a zygote splits into two zygotes.
c. two sperm reach an egg at the same time.
d. one egg from each ovary is fertilized.

Explanation:

Fraternal twins form when two separate eggs (ova) are released from the ovaries during the same menstrual cycle and each is fertilized by a different sperm. Option A is incorrect as it's not different menstrual cycles. Option B describes how identical twins form. Option C is incorrect as only one sperm fertilizes an egg in normal circumstances. Option D is correct as it accurately describes the formation of fraternal twins where one egg from each ovary or two eggs from the same ovary are fertilized by different sperm.

Answer:

D. One egg from each ovary is fertilized.