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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 ...
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]
Nearly half (8 of 17) of twins examined in one study were monozygotic (identical) twins, a few more than the average of 30%. [4] Twin births were noted from the early twentieth century, when the first immigrants included seventeen sets of twins, and have been observed through several generations in the latter part of the twentieth century. [6]
Conjoined twins, popularly referred to as Siamese twins, [1] [2] are twins joined in utero. [ a ] It is a very rare phenomenon, estimated to occur in anywhere between one in 50,000 births to one in 200,000 births, with a somewhat higher incidence in southwest Asia and Africa. [ 5 ]
During embryonic development, twins can form from the splitting of a single embryo (monozygotic) which forms identical twins or the twins can arise from separate oocytes in the same menstrual cycle which forms fraternal twins. Although the latter is more frequent, monozygotic is the reason conjoined twins can develop.
Stewart and Cyril Marcus (June 2, 1930 – July 1975) were identical twin gynecologists who practiced together in New York City. They died together in July 1975 at the age of 45. They died together in July 1975 at the age of 45.
Monochorionic twins are monozygotic (identical) twins that share the same placenta. If the placenta is shared by more than two twins (see multiple birth ), these are monochorionic multiples . Monochorionic twins occur in 0.3% of all pregnancies. [ 1 ]
The twins appeared on the television series Real People as motivational speakers, and then went on to play landlords in the 1981 television series Foul Play. [2] They also hosted a short-lived game show titled That Awful Quiz Show in 1982. [1] In 1989, the twins appeared in commercials for a chain of pizza restaurants known as Pizza Factory. [3]