Mmastodon ScienceBiology first seen 3 h ago, last 32 min ago, peak #10
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 described as 'half-identical' or '1.5 identical', occur when a single egg is fertilized by two sperm and then splits, producing siblings who are identical on their mother's side but share only about 78% of their paternal genes. Only two confirmed cases are known: one in the United States in 2007 and one in Australia in 2019, both detected during pregnancy.
Why now: The striking rarity of the phenomenon and the two confirmed cases are being shared and discussed online.
sesquizygotic twinsUnited StatesAustralia
Rank over time, top of the chart is #1. 3 snapshots from 3 h ago to 32 min ago.
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 · 5
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