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Twins are two offspring produced by the same pregnancy. [1] Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell. [2]
Fraternal twins at two weeks old. The technical term for "fraternal" is "dizygotic" (twins) or "polyzygotic" (triplets or higher order). Fraternal twin sisters taking a nap. Nonidentical twins, the most common kind of multiple birth among humans, occur in about 1 out of every 80 pregnancies.
Homopaternal superfecundation is fertilization of two separate ova from the same father, leading to fraternal twins, [3] while heteropaternal superfecundation is a form of atypical twinning where, genetically, the twins are half siblings – sharing the same mother, but with different fathers.
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 ...
Francesca Farago and fiancé Jesse Sullivan have revealed the names of their newborns!. The Too Hot to Handle alum, 31, and the TikTok star, 35, became parents to fraternal twins — a boy and a ...
Fraternal twins develop from two different eggs by two different sperm -- so they can often look slightly different. Although some, like Mary Kate and Ashley Olsen, end up looking so much alike ...
The Hayes also have two sets of twins, Kevin and Kyle (eight years old at the time of the sextuplets' birth) and Kieran and Meghan (five years old). They are the only family in the United States to have two sets of twins and a set of sextuplets. [93] The family was the subject of a reality television show, Table for 12, on TLC in the U.S. [94]
“I think it is safe to call the girls fraternal twins,” said Richard O. Davis, professor in the UAB Division of Maternal-Fetal Medicine and a doctor who co-managed Hatcher’s pregnancy ...