![]() ![]() Why is this important? Well, if two twins share a chorion, they’ll share one placenta. It also contributes to placenta development. The chorion connects the amnion, amniotic fluid, and the fetus to the placenta. The chorion is the outermost fetal membrane. We know what you’re thinking… what is a chorion? (And while we’re at it, what’s amnion/an amniotic sac?) And why do they matter? The type of twins (fraternal or identical) and the timing of their development affects whether the babies shared or had their own separate chorionic and amniotic sacs. Still with us? Well, there’s even more to it than whether they are identical and fraternal if you want to know how a set of twins developed. (The mother releases two eggs at around the same time, which are fertilized by two different sperm.) They can be different sexes with different hair and eye colors or the same sex and look very similar.įraternal twins are also called dizygotic twins, because they come from two different eggs. ![]() This means they can appear nearly identical or completely different. On the other hand, fraternal twins only share about 50 percent of their chromosomes, as other siblings do. The single egg splits in two shortly after fertilization.)īecause identical twins come from the same egg/sperm, their chromosomes will be identical, which means they will be the same sex and have the same genetic characteristics (e.g., hair and eye color). (Identical twins are created when one egg and sperm meet like normal. ![]() Identical twins are also sometimes called monozygotic twins, because they came from the same fertilized egg. Two major categories twins are typically divided into are identical and fraternal. Believe it or not, the term twins is pretty broad! When someone talks about twins they are referring to two babies that develop during the same pregnancy, but this can happen in many different ways. ![]()
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