How should twins who share a placenta and come from one fertilized ovum be identified?
a. Dizygotic
b. Trizygotic
c. Genetically different
d. Monozygotic
ANS: D
Monozygotic twins, also known as identical twins, originate from one fertilized ovum and share a placenta. Monozygotic twins carry the same genetic code. Dizygotic twins are the result of two separate ova being fertilized at the same time.
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