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Are twins made by mother or father?

For a given pregnancy, the odds of conceiving fraternal twins are only determined by the mother's genetics, not the father's. Fraternal twins happen when two eggs are simultaneously fertilised instead of just one.

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There’s both fact and fiction to the rumours that twins run in families and tend to skip a generation. Here's what you need to know about the science behind family heredity and twins. Twin genetics depend on what kind of twins we are talking about. Identical twins vs fraternal twins. The important difference between identical and fraternal twins is the number of fertilised eggs involved. Identical twins come from a single fertilised egg. Fraternal twins come from two different ones.

Identical twinning and family heredity

Identical twins happen when a single embryo splits in two soon after fertilisation. This is why identical twins have identical DNA. They came from the same fertilised egg. Since embryo splitting is a random spontaneous event that happens by chance, it doesn’t run in families. Genes are not involved and there's no scientific evidence that being from a family with identical multiples has any impact on your odds of having twins. The same is not true for fraternal twins. So, having identical twins is not due to genetics. On the other hand, fraternal twins can run in families. In fact, a woman that has a sibling that is a fraternal twin is 2.5 times more likely to have twins than average!

Fraternal twinning and family heredity

For a given pregnancy, the odds of conceiving fraternal twins are only determined by the mother’s genetics, not the father's. Fraternal twins happen when two eggs are simultaneously fertilised instead of just one. There appears to be a genetic link that predisposes some women to hyperovulation, which means releasing more than one egg during ovulation, or each menstrual cycle. Heredity on the father's side does not increase a couple's odds of having multiples. This is true even if his family is full of multiples. Men, of course, don't ovulate, so even if they've inherited that hyperovulation gene from their parents, it doesn't increase their own odds of conceiving twins. It's all about the fertilisation of eggs and a father’s genes can’t make a woman release two eggs.

Do twins skip a generation?

You may have heard that twins 'skip a generation'. While it's not a blanket true statement, it is actually based on some truth. Here's how: we know that twinning is due to factors on the woman's side, like hyperovulation. But it takes two to make a baby, or babies in our case! This is where the skipping is relevant. A man's family history of twins can’t increase his partner’s chance of having twins. If a man has inherited the hyperovulation gene from his mother, he may pass this gene on to his daughter, but it won't impact on the chances of him conceiving multiples with his own partner. Men, of course, don't ovulate, so the chance of twins or more is up to the woman. The man's daughter, however, having inherited the hyperovulation gene through her father is then more likely to release more than one egg when she ovulates and therefore could conceive fraternal twins. In that scenario, it would seem as though the twins have, in essence, skipped a generation.

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Do elves have birthdays?

Since elves live for so long it is widely believed that they do not celebrate birthdays. This could not be further from the truth. All elves celebrate birthdays, but how they are celebrated varies from culture to culture. The earliest known rites were made by the first elves, the Woodland Elves of Miyla.

Most of the younger races do not believe that elves celebrate birthday. This is far from the truth. Elves celebrate milestone birthdays with music and rites of passage. The oldest race in all of the worlds is the elves. They are the oldest due to their close kinship with dragons and their long lives. Since elves live for so long it is widely believed that they do not celebrate birthdays. This could not be further from the truth. All elves celebrate birthdays, but how they are celebrated varies from culture to culture. The earliest known rites were made by the first elves, the Woodland Elves ofThe Woodland Elves of Miyla are more commonly known as thewere the first known elves to celebrate birthdays. These Woodland Elves didn't need much of an excuse to celebrate life wherever they found it. But for some reason, the birthdays of their own were very important. They celebrated with music, dancing, feasting, and drinking. The one that was being celebrated would be given gifts for themselves and their family. The gifts could be useful or just for fun. Hide and seek was a common game for the little ones to play as their elders chatted about the future. The one being celebrated would also sometimes have to pass a rite of passage. The rite would differ with age and season.

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