The nurse is conducting a staff in-service on multifetal pregnancy. Which statement about dizygotic twin development should the nurse include in the teaching session?
a. Dizygotic twins arise from two fertilized ova and are the same sex.
b. Dizygotic twins arise from a single fertilized ovum and are always of the same sex.
c. Dizygotic twins arise from two fertilized ova and may be the same sex or different sexes.
d. Dizygotic twins arise from a single fertilized ovum and may be the same sex or different sexes.
ANS: C
Dizygotic twins arise from two ova that are fertilized by different sperm. They may be the same or different gender, and they may not have similar physical traits. Monozygotic twins are always the same sex. A single fertilized ovum that produces twins is called monozygotic. Dizygotic twins are from two fertilized ova and may or may not be the same sex.
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