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Twins are concordant when both have or both lack a given trait. [ 1 ] The ideal example of concordance is that of identical twins , because the genome is the same, an equivalence that helps in discovering causation via deconfounding , regarding genetic effects versus epigenetic and environmental effects ( nature versus nurture ).
In such cases, fraternal twins can differ from each other quite dramatically in terms of skin color or other physical characteristics. Numerous sets of mixed twins have been born. [1] [2] [3] Much more rarely, mixed twins can arise as a result of heteropaternal superfecundation. [4] [3]
On January 22, 2019, the National Society of Genetic Counselors released an article Chimerism Explained: How One Person Can Unknowingly Have Two Sets of DNA, where they state, "where a twin pregnancy evolves into one child, is currently believed to be one of the rarer forms. However, we know that 20 to 30% of singleton pregnancies were ...
Image credits: MontEcola #5. My wife is an identical twin. When we first started dating I could tell them apart from their voices, smell, makeup, and eyes.
This is an accepted version of this page This is the latest accepted revision, reviewed on 13 December 2024. 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 ...
As the mother of 19-year-old boy/girl twins, I've noticed that people's assumptions about twins are often wrong. To be clear, I'm sure some of the common twin myths apply to others, but so far ...
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. Terms used for the number of offspring in a multiple birth, where a number higher than three ends with the suffix -uplet: two offspring – twins; three offspring – triplets
Last night we received an invitation for one of my two twin girls to go to a birthday party. One of the two of them. And if you’re new, I have almost five-year-old twins, they are in TK and they ...