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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.
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 ...
Research on the fraternal birth order effect has shown that for every older brother a male child has, there is a 33% increase in the naturally occurring odds of the male child being homosexual. [7] [19] [18] The naturally occurring odds of a male child (without any older brothers) being homosexual are estimated to be 2%.
Triplet and higher multiple births nosedive. 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 ...
Things I learned (from my doctors and my own reading) after I found out I was having twins: 1. At age 35, a woman’s odds of having a multiples pregnancy drastically increases…and it continues ...
According to the BBC, there is a one in 500 chance fraternal twins will have different skin colors if they're born to a interracial couple. "Now we have grown older, ...
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]
I Was Having Twins. Briana Pozner. January 31, 2025 at 8:18 AM. ... After all, shortly after the fateful ultrasound, I discover that the odds of us having gotten spontaneously pregnant with twins ...