can you have twins from two different guys?
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It is possible for twins to have different fathers in a phenomenon called heteropaternal superfecundation, which occurs when two of a woman's eggs are fertilized by sperm from two different men. ... Identical twins occur if that fertilized egg divides into two separate eggs, early in the pregnancy.
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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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Originally Answered: Can two people born like two years apart, be twins? No. Twins are genetically identical siblings or siblings born from the same pregnancy.
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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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Among monozygotic twins, in extremely rare cases, twins have been born with different sexes (one male, one female). ... In these cases, although the twins did form from the same fertilized egg, it is incorrect to refer to them as genetically identical, since they have different karyotypes.
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While men can carry the gene and pass it on to their daughters, a family history of twins doesn't make them any more likely to have twins themselves. 3﻿ But, if a father passes on the "twin gene" to his daughter, then she may have a higher chance than normal of having fraternal twins.
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The chances of having identical twins is relatively rare — around 3 or 4 in every 1,000 births. And while it may be obvious, identical twins are always the same sex, either both boys or both girls, at birth. Why? Well, they don't just look alike — they also share the exact same DNA.
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There are two types of twins – identical (monozygotic) and fraternal (dizygotic). ... This differs from fraternal twins, where two eggs (ova) are fertilised by two sperm and produce two genetically unique children, who are no more alike than individual siblings born at different times.
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When both eggs are fertilized, the resulting siblings are fraternal twins. Because this gene can be passed on, the tendency to have fraternal twins can in fact run in families. Identical twins, on the other hand, result from one fertilized egg randomly splitting in two, creating two siblings with identical DNA.
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It all started when two sperm fertilized an egg at the exact same time. Twins can be fraternal, identical — and in extremely rare cases — semi-identical. ... Because identical twins share all of their genes, they can't be of opposite sexes like fraternal twins can.
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But something close to this just might be. While twins of the nonidentical kind can't become conjoined, they can become something called chimeras. This is where fraternal twins fuse together very early on in development. The end result is not two separate, connected people but one person with a mix of both twins.
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Identical twins Identical (monozygotic) twins happen when a single egg (zygote) is fertilised. The egg then divides in 2, creating identical twins who share the same genes. Identical twins are always the same sex, so if your twins are identical, you'll have 2 girls or 2 boys.
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The chances of having identical twins is relatively rare: 3 or 4 per every 1,000 births. Fraternal twins result when two different eggs are fertilized, each by a different sperm cell. This can happen when a woman produces several eggs (most often two) at the same time. This is called hyperovulation.
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It is possible for twins to have different fathers in a phenomenon called heteropaternal superfecundation, which occurs when two of a woman's eggs are fertilized by sperm from two different men.
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Non-identical (dizygotic) twins happen when 2 separate eggs are fertilised and then implant into the woman's womb (uterus). These non-identical twins are no more alike than any other 2 siblings. Non-identical twins are more common. The babies may be of the same sex or different sexes.
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technically not possible. Conjoined twins are identical twins, coming from the same fertilised egg so they will always be the same sex because their sex was determined at the point of fertilisation from the male sperm. ... This could happen with conjoined twins, and you could end up with what looks like a boy and a girl.
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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.