Fraternal or dizygotic twins develop from two different eggs fertilized by separate sperm; they generally share about 50 percent of their genes. Therefore, fraternal twins are essentially like typical ...
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Why multiracial twins may look as different as their parents
File this under extremely rare but scientifically possible: Twins born to parents of different races can look so different ...
Fascination with twins and what twin studies tell us about human nature is universal. There is no question that behavioral and medical science advances have happened largely because twins yield a ...
For the best experience, please enable JavaScript in your browser settings. Scientists describe twins as two beings who share the same uterus at the same time. They ...
The special relationship between twins allows researchers to examine the differences between genetic and environmental influences over both physical and mental health, as well as traits and behaviors.
Although there are some rare exceptions, identical twins are almost always the same sex. Because identical twins occur when a single fertilized egg splits and forms two embryos, each embryo has the ...
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