The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
If a single egg-- that, of course, comes from a single ovary-- is fertilized and the egg splits-- and that's something that happens further along in the process of fertilization and differentiation of the embryo-- well, then what you get are identical twins.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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monozygotic twins are identical twins and what that means is they that one egg and sperm were fertilized and then split into two identical meaning two identical genetic um uh differences