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The human twin birth rate in the United States rose 76% from 1980 through 2009, from 9.4 to 16.7 twin sets (18.8 to 33.3 twins) per 1,000 births. [5] The Yoruba people have the highest rate of twinning in the world, at 45–50 twin sets (90–100 twins) per 1,000 live births, [6] [7] [8] possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may ...
In 2004, of the people younger than 35 who gave birth with the help of IVF, 32.7% delivered twins, and 4.9% delivered triplets, according to doctors at the Washington University School of Medicine ...
204 sets of twins and 2 sets of triplets born to 2,000 families [1] Velyka Kopanya Ukraine: Europe: 122 twins in a population of 4,000 [2] Igbo-Ora: Nigeria: Africa: 45 to 50 sets of twins per 1000 live births [3] Cândido Godói: Brazil: South America: One in 10 births involves twins [4] Mohammadpur Umri: India: Asia: One in 10 births involves ...
Dizygotic (fraternal) twins can be caused by a hyperovulation gene in the mother. [8] Although the father's genes do not influence the woman's chances of having twins, he could influence his children's chances of having twins by passing on a copy of the hyperovulation gene to them. Monozygotic (identical) twins do not run in families.
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A second and more common design is the twin study in which the similarity of identical and fraternal twins is used to estimate heritability. These studies can be limited by the fact that identical twins are not completely genetically identical , potentially resulting in an underestimation of heritability.
In 2019, a Chinese woman was reported to have two babies from different fathers, one of whom was her husband and the other was a man having a secret affair with her during the same time. [12] In 2022, a 19-year-old Brazilian from Mineiros gave birth to twins from two different fathers with whom she had sex on the same day. [13]
After all, shortly after the fateful ultrasound, I discover that the odds of us having gotten spontaneously pregnant with twins, meaning without fertility assistance or genetic influence, were ...