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    People are fascinated by twins, and thanks in large part to advances in fertility science, there are more twins than almost any other time in history. Identical and fraternal twins are the most common, but there are also several other rare types. Read on to learn more about twins. Identical twins are also called monozygotic twins, meaning one fertilized egg. They occur when one egg is fertilized by one sperm as usual, but the egg splits in two shortly afterward.
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    Incest between twins

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    Incest between twins - Wikipedia

    Identical twins are also known as monozygotic twins. They result from the fertilization of a single egg that splits in two. Identical twins share all of their genes and are always of the same sex. In contrast, fraternal, or dizygotic, twins result from the fertilization of two separate eggs during the same pregnancy. They share half of their genes, just like any other siblings.
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    Can Identical Twins Be Different Sexes?

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    Are there more same-sex SS than opposite-sex OS pairs among dizygotic twins? However, recent research on the sex-specific nature of breastmilk suggests that OS twins might be at a developmental disadvantage relative to SS twins. There may therefore be evolutionary selection for the tendency to have SS twins and against the tendency to have OS twins. We performed a one-sample t -test of the proportion of SS dizygotic twins against the theoretical null value of 0. The proportion of SS pairs among dizygotic twins was 0.
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