Monozygotic (identical)twins are the result of
A) one sperm fertilizing two different eggs.
B) one egg being fertilized by two different sperm.
C) one embryo splitting to become two embryos.
D) two different sperm fertilizing two different eggs.

Question

Quizplus · Accepted Answer

Monozygotic (identical) twins occur when one fertilized egg splits into two embryos. This results in the twins having nearly identical genetic material. Option A (one sperm fertilizing two different eggs) and D (two different sperm fertilizing two different eggs) result in fraternal twins who are genetically no more similar than non-twin siblings. Option B (one egg being fertilized by two different sperm) is not biologically possible.

Monozygotic (Identical)twins Are the Result of