Under what circumstances can twins be born in humans?
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A twin is one of two offspring produced in the same pregnancy.Twins can either bemonozygotic ("identical"), meaning that they develop from onezygotethat splits and forms twoembryos, ordizygotic("fraternal"), meaning that they develop from two eggs, each fertilized by separate sperm cells.
In contrast, a fetus which develops alone in the womb is called asingleton, and the general term for one offspring of a multiple a births multiple .
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In contrast, a fetus which develops alone in the womb is called asingleton, and the general term for one offspring of a multiple a births multiple .
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Answered by
45
When two eggs cells are fertilized by two two different sperms (fraternal twins) or a zygote after fertilization splits into halves (identical twins).
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