Are fraternal twins always opposite sex

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10 Facts About Fraternal Twins That You Probably Didn’t Know

Chromosomes from the father's sperm determine gender: XX for a girl and ( Monozygotic—identical—twins, on the other hand, are always the.

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Description:Reproductive system - female - Fertility, pregnancy and childbirth Summary Multiple births are more common than they were in the past, due to the advancing average age of mothers and the associated rise in assisted reproductive techniques, in particular the use of fertility drugs. Twins account for over 90 per cent of multiple births. There are two types of twins — identical monozygotic and fraternal dizygotic. To form identical twins, one fertilised egg ovum splits and develops two babies with exactly the same genetic information.

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