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Human Reproduction — Bio Zoology STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12Bio ZoologyHuman Reproduction3 Marks
Question
Differentiate between monozygotic and Dizygotic twins.
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Answer

Monozygotic twins:
  1. Monozygotic (Identical) twins are produced when a single fertilized egg splits into two during the first cleavage.
  2. They are of the same sex, look alike and share the same genes.
Dizygotic twins:
  1. Dizygotic (Fraternal) twins are produced when two separate eggs are fertilized by two separate sperms.
  2. The twins may be of the same sex or different sex and are non-identical.

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