Question

What are the events which lead to the formation of (a) identical twins, and (b) fraternal twins?

Answer 1

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a) Identical twins

They develop from one zygote, which splits and forms two embryos, or dizygotic

b) Fraternal twins

They develops from a separate egg and each egg is fertilized by its own sperm cell.

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Answer 2

a) Identical twins

They develop from one zygote, which splits and forms two embryos, or dizygotic

b) Fraternal twins

They develops from a separate egg and each egg is fertilized by its own sperm cell.