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Monozygotic twins also known as identical twins are siblings that share the same genetic information because of their prenatal development. Monozygotic twins result from the fertilization of one egg and the division of that single embryo forming two embryos. [4]
In the short term, incestuous reproduction is expected to increase the number of spontaneous abortions of zygotes, perinatal deaths, and postnatal offspring with birth defects. [15] The advantages of inbreeding may be the result of a tendency to preserve the structures of alleles interacting at different loci that have been adapted together by ...
According to the Centers for Disease Control and Prevention (CDC), most birth defects are believed to be caused by a complex mix of factors including genetics, environment, and behaviors, [13] though many birth defects have no known cause. An example of a birth defect is cleft palate, which occurs during the fourth through seventh weeks of ...
Research shows that siblings are still—on average—about four years apart, but present-day fertility resources (not to mention an evolving definition of the American family since the 1960s) is ...
The VACTERL association (also VATER association, and less accurately VACTERL syndrome) refers to a recognized group of birth defects which tend to co-occur (see below).This pattern is a recognized association, as opposed to a syndrome, because there is no known pathogenetic cause to explain the grouped incidence.
Multiple studies have established consanguinity as a high cause for birth defects and abnormalities. A risk of autosomal recessive disorders increases in offspring coming from consanguineous marriages due to the increased likelihood of receiving recessive genes from cognate parents. [2]
This is an accepted version of this page This is the latest accepted revision, reviewed on 9 February 2025. American conjoined twins (born 1990) Abby and Brittany Hensel Born Abigail Loraine Hensel Brittany Lee Hensel (1990-03-07) March 7, 1990 (age 34) New Germany, Minnesota, U.S. Education Bethel University Occupation(s) Fifth-grade teachers at Sunnyside Elementary in New Brighton, Minnesota ...
A 1998 study found that 60% of its schizophrenic sample and 38% of their siblings had 6 or more MPAs (especially in the craniofacial area), while only 5% of the control group showed that many. [2] The most often cited MPA, high arched palate, is described in articles as a microform of a cleft palate. [3]