Mmastodon ScienceBiology first seen 7 h ago, last 1 h ago, peak #8
Sesquizygotic twins: the rare 'half-identical' siblings explained
Original: 🧬 Sesquizygotic twins are real, the "1.5 identical" kind. One egg was fertilized by two sperm, then split into two peopl
Sesquizygotic twins, sometimes called 'half-identical' twins, occur when a single egg is fertilized by two sperm before splitting into two embryos. The resulting siblings share all of their maternal DNA but only about 78% of their paternal DNA. Only two confirmed cases exist worldwide: one in the United States in 2007 and one in Australia in 2019, identified during pregnancy. People are sharing the biology behind this extraordinary rarity.
Why now: The extreme rarity of the phenomenon, with only two confirmed cases ever, makes it a fascinating topic to explain and share.
sesquizygotic twinsUnited StatesAustralia
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Evidence
- 🧬 Sesquizygotic twins are real, the "1.5 identical" kind. One egg was fertilized by two sperm, then split into two people. Identical on the mom's side, about 78% shared on the dad's. Only two confirmed cases: US 2007, and Australia 2019, spotted in the womb. Rare enough that a… · jcrabapple@dmv.community · 8
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