How many eggs and sperm contribute DNA to fraternal twins?
a. 1 egg, 1 sperm
b. 2 eggs, 1 sperm
c. 1 egg, 2 sperm
d. 2 eggs, 2 sperm
a. 1 egg, 1 sperm
b. 2 eggs, 1 sperm
c. 1 egg, 2 sperm
d. 2 eggs, 2 sperm