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15. Dizygotic twins: a. are as closely related as monozygotic twins b. are as closely related as non-twin siblings C. share 1

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Answer: “b” as closely related as non twin siblings.

Dizygotic twins are also known as fraternal twins. The dizygotic twins are born to a woman, if during ovulation(release of egg) the ovaries releases two eggs instead of one, in that case if the both the eggs are fertilised by the two different sperms,two zygotes which will develop into two different embryos will be formed resulting in dizygotic twins being born.

So it is fertilisation of altogether two different sets of gamates hence they are as close as any other non twin siblings.

Note: in case of monozygotic twins there is fertilisation of only one set of gamates giving rise to a zygote. This zygote during development can split into two different masses of cells giving rise to two embryos. Hence in this case the twins born will be exactly identical to each other.

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