can twins have different fathers?
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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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However, for a given pregnancy, only the mother's genetics matter. Fraternal twins happen when two eggs are simultaneously fertilized instead of just one. A father's genes can't make a woman release two eggs. It sounds like fraternal twins do indeed run in your family!
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Identical twins are either both male or both female so cannot conceive a child together except by some dramatic genetic engineering. Even if two female identical twins had children by the same father their children would not be completely genetically identical.
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If twins are a boy and a girl, clearly they are fraternal twins, as they do not have the same DNA. A boy has XY chromosomes and a girl has XX chromosomes. Girl-boy twins occur when one X egg is fertilized with an X sperm, and a Y sperm fertilizes the other X egg.
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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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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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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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Among monozygotic twins, in extremely rare cases, twins have been born with different sexes (one male, one female). ... Another abnormality that can result in monozygotic twins of different sexes is if the egg is fertilized by a male sperm but during cell division only the X chromosome is duplicated.
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The Science of How Women Can Have Twins With 2 Different Fathers. ... Superfecundation twins: When a woman has intercourse with two different men in a short period of time while ovulating, it's possible for both men to impregnate her separately. In this case, two different sperm impregnate two different eggs.
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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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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 then 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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Superfecundation twins: When a woman has intercourse with two different men in a short period of time while ovulating, it's possible for both men to impregnate her separately. In this case, two different sperm impregnate two different eggs. This is what happened to the woman in New Jersey.
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Having identical twins is not genetic. On the other hand, fraternal twins can run in families. ... However, for a given pregnancy, only the mother's genetics matter. Fraternal twins happen when two eggs are simultaneously fertilized instead of just one.
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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. Twins are more or less equally likely to be female or male.
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These twins can be the same or different sexes and are no more alike than any brother or sister, despite being born together. In this case of semi-identical, or sesquizygotic, twins, the egg is thought to have been fertilised simultaneously by two sperm before it divided.
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As fraternal twins originate from separate conceptions, they can either be all boys, girls, or one of each. ... 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.
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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.