Monozygotic twins are _____, while dizygotic twins are _____.
A) always the same sex; always different sexes
B) the same sex 50% of the time; always the same sex
C) always the same sex; the same sex 50% of the time
D) always different sexes; always the same sex
E) the same sex 50% of the time; always different sexes

Question

Quizplus · Accepted Answer

Monozygotic twins, also known as identical twins, come from a single fertilized egg that splits into two embryos. As a result, they are always the same sex. Dizygotic twins, also known as fraternal twins, come from two separate eggs that are fertilized by two separate sperm. Therefore, they have the same chance of being the same sex (50%) as any other full siblings.

Monozygotic Twins Are _____, While Dizygotic Twins Are _____

Monozygotic Twins Are _, While Dizygotic Twins Are _