It makes sense that identical twins would have the exact same DNA, right? Spoiler alert: Not always! Here's why. Identical ...

Twin studies have been used extensively in medical research and are instrumental in estimating the relative importance of genetic versus nongenetic components in the etiology of human disease.

While the basics of how identical twins originate is clear, the mystery lies in why. Identical twins arise from a single fertilized egg, or zygote, splitting into embryos with duplicate DNA, but what ...

Identical twins arise from a single zygote while non-identical twins from two zygotes produced simultaneously. Each DNA molecule has two strands held together by bonds between compounds on the ...

Within hours of fertilisation, this new cell, called a zygote, divided into two identical ... the embryos create near-replicas of themselves. Identical twins. This quirk of nature has given ...

Independent assortment and the random nature of fertilisation lead to variation in living organisms – no two organisms are the same (apart from identical twins). During fertilisation the haploid ...