Question Detail
Question
What is the probability that the zygotes of a dizygotic twin will be males?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Dizygotic (fraternal) twins result from two separate eggs fertilized by two separate sperm. The probability of one zygote being male (XY) is 1/2. The probability of the second zygote also being male is also 1/2. Since these are independent events, the probability that both are male is (1/2) * (1/2) = 1/4.
Hint
Multiply the probability for each twin being male, as these are independent events.