The twins formed from a single embryo during early embryonic development are called ___.

monozygotic twins

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siamese twins

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fraternal twins

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dizygotic twins

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Solution

The correct option is A
monozygotic twins
During the early period of embryonic development, that is within 8 days of zygote formation, the cells are divided into two separate groups. Those cells develop into two embryos and thus monozygotic twins are formed.
Siamese twins are formed if the embryonic cells are divided into 2 groups after 8 days of zygote formation.
Dizygotic or fraternal twins are formed from 2 zygotes.

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