Identical twins are born when

Two ova crosses with two sperms

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One ovum crosses with one sperm

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Two sperms crosses with one ovum

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None of the above

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Solution

The correct option is A One ovum crosses with one sperm
Identical twins are born when one ovum crosses with one sperm to form one zygote (monozygotic). This zygote later divides into two embryos. These embryos share the same womb. Non-identical twins are born when two ova crosses with two sperms at the same time to form two zygotes (dizygotic).
Thus, the correct answer is option B.

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Similar questions

Cross made between two parents with one contrasting trait is called a ___ cross.

A

B

30 m / s

60 m / s

A

B

A

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