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How do non-identical twins occur?

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Answer:

Fraternal twins (and other multiples) occur when the female ovulates more than one egg at a time and more than one is fertilized. Females that are overweight or older are more likely to ovulate more than one egg at a time. Fertility drugs encourage the body to 'drop' more than one at a time. And the tendency can be inherited.

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Aggie80

First answer by ID0415725984. Last edit by Aggie80. Contributor trust: 4975 [recommend contributor ]. Question popularity: 1 [recommend question].

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