Question:
How many eggs are released by a human ovary in a month? How many eggs do you think would have been released if the mother gave birth to identical twins? Would your answer change if the twins born were fraternal?
Answer:
Only one egg is released by a human ovary in a month.
Identical twins are produced a single egg by separation of early blastomeres resulting from first zygotic cleavage.
If the twins born were fraternal, then twins would have developed from two separate eggs. As a result, two eggs are released from ovary and get fertilized by two sperms. Hence young baby may have separate gene and are known to be fraternal twins.
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