Which of the following represents the fertilization process for monozygotic twins?
A) One egg is fertilized by one sperm and then splits.
B) One egg splits and is then fertilized by two different sperm.
C) One egg is fertilized by two different sperm.
D) Two eggs are fertilized by the same sperm.

Question

Quizplus · Accepted Answer

Monozygotic twins (identical twins) result from the fertilization of a single egg by a single sperm, which then splits into two embryos. Therefore, option A is the correct representation. Option B is incorrect because an egg cannot be fertilized by two different sperm. Option C is incorrect because fraternal twins (dizygotic twins) result from the fertilization of two different eggs by two different sperm. Option D is incorrect because it describes superfecundation, which is rare and occurs when two eggs are fertilized by two different sperm.

Which of the Following Represents the Fertilization Process for Monozygotic