SAT Subject Biology Practice Question 169: Answer and Explanation
19. A female chimpanzee recently gave birth to an infant while in captivity. Because the paternity of the infant is unclear, scientists tested the DNA from two male chimpanzees, along with the female and infant. The resulting electrophoresis gel is shown.
Which fragments must the infant have received from its father?
A. 1 and 2
B. 2 and 5
C. 3 and 4
D. 3 and 5
E. 4 and 5
Correct Answer: D
Fragments 3 and 5 are not present in the mother's DNA. Therefore, the infant must have received the genetic information leading to these fragments from its father.