1.

Identical twins are born when:A. Monozygotic twinsB. Dizygotic twinsC. Fraternal twinsD. Both B and C

Answer» Correct Answer - A
(A) Tpes of Twins
1. Monozygotic twins or identical twins
After first cleavage, both blastomere separates and form 2 embryos which always have the same sex.
2. Dizygotic twins or non-identical twins or fraternal twins
In this, two eggs are fertilized by 2 different sperms, leads to the formation of two zygote.
Sex may be same or different.
3. Siamese twins
After first cleavage the two blastomeres do not completely separate but lead to the formation of 2 embryos which is of same sex.
Due to incomplete separation both embryos are connected to each other by some parts.


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