are fraternal twins likely to have twins?
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Having fraternal twins is in your genes—and in your hormones. Researchers have long known that women whose families include fraternal twins are more likely to give birth to twins themselves, and they're finally starting to figure out why. ... Because of that, several large databases track twins as they age.
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Each of these twins is the result of a separate egg being fertilized by a separate sperm. So whatever is true for brothers and sisters, is true for fraternal twins too. And since brothers and sisters can have different blood types, so too can fraternal twins. It is a different story if the twins are identical.
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Usually, the chances of fraternal twins being boys, girls, or a combination of both are the same as for any normal babies. Identical twins (Monozygotic), on the other hand, are always of the same gender. Fraternal twins can be two boys, two girls or one girl and one boy.
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Identical, or monozygotic, twins may or may not share the same amniotic sac, depending on how early the single fertilized egg divides into 2. If twins are a boy and a girl, clearly they are fraternal twins, as they do not have the same DNA.
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Genes are not involved. The same is not true for fraternal twins. Fraternal twins happen when two independent eggs are each fertilized by different sperm. This is why the DNA of fraternal twins is different.
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Fraternal -- or dizygotic -- twins form from two eggs that have been fertilized by two of the father's sperm, producing two genetically unique siblings. They share 50% of their DNA. But "semi-identical" twins are so rare, experts say they have only identified two cases -- ever.
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The most common type of twins are non-identical twins, which can be the same or different sexes. Non-identical twins are also known as fraternal twins or dizygotic twins (from two zygotes, what we call the earliest embryo when the egg and sperm fuse).
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Well, what are the odds? Kasraie has found two studies of the incidence of heteropaternal superfecundation, both from the early 1990s. One author claims that one in 400 pairs of fraternal twins (those arising from two eggs) fits the description. The second author puts the figure at one in 13,000 cases of paternity.
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Twins can be different in appearance, having different skin colors, if they came from different eggs. When two eggs are fertilized by two different sperms, the babies will be fraternal twins and have different appearances, this is because they will have different DNA makeup and chromosomes.
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Identical twins have 100% of their DNA the same while fraternal twins share only 50%. ... Fraternal twins are really just siblings who share the same womb. Each starts out as a separate egg fertilized by a separate sperm. They don't share any more DNA than do any two siblings.
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They Can Be Different Genders or the Same Because fraternal twins originate from separate conceptions, they can be boys, girls, or one of each (just like a singleton baby). Chromosomes from the father's sperm determine gender: XX for a girl and XY for a boy.
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Boy/girl twins are always fraternal or (dizygotic); they can only form from two separate eggs that are fertilized by two separate sperm. The terms identical and fraternal don't describe what the twins look like, but actually how they form.
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A set of identical twins and fraternal twins is only around 1 in 10,000, or the same odds that you're going to fall off your toilet and end up in hospital! Having two sets of identical twins is pretty damn unlikely, with only 1 chance in 70,000.
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Fraternal twins really aren't any different than two siblings (except they happened to share the same womb at the same time). Each of these twins is the result of a separate egg being fertilized by a separate sperm. ... And since brothers and sisters can have different blood types, so too can fraternal twins.
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Having identical twins is not genetic. On the other hand, fraternal twins can run in families. Genetics can definitely play a role in having fraternal twins.
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Around two in three sets of twins are fraternal. Two separate eggs (ova) are fertilised by two separate sperm, resulting in fraternal or 'dizygotic' (two-cell) twins. These babies will be no more alike than siblings born at separate times.
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Fraternal twins are considered “dizygotic,” and that's when two separate eggs are fertilized by a two different sperm. “Each twin has his or her own placenta and amniotic sac. ... It seems like twins develop a bond long before they grace us with their presence in this world — whether they're identical or fraternal.