Question

question 9 of 10
a couple has twins. one is a male and one is a female. how do you know what kind of twins they are?
a. they are identical twins, because they have the same parents.
b. they are fraternal twins, because they have the same parents.
c. they are fraternal twins, because they do not have the same dna.
d. they are identical twins, because they were born at the same time.

Explanation:

Identical twins come from a single - fertilized egg and have the same DNA, so they are of the same sex. Fraternal twins come from two separate eggs fertilized by two separate sperm, and can be of different sexes. Since the twins are a male and a female, they must be fraternal and have different DNA.

Answer:

C. They are fraternal twins, because they do not have the same DNA.