are twins passed through the mother or father?
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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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Shiva Singh, molecular geneticist at The University of Western Ontario, have found that identical twins are not necessarily genetically identical. During normal reproductive development, a single cell forms by combining an egg, genetic material from the mother, and sperm, genetic material from the father.
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Identical (monozygotic) twins develop from a single fertilized egg that splits in two. Thus they are genetically identical—nature's own human clones. Fraternal (dizygotic) twins develop from two separate fertilized eggs.
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In fact, they have the same DNA! So no, conjoined twins with different fathers is not possible. ... 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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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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Identical twins are also known as monozygotic twins. They result from the fertilization of a single egg that splits in two. Identical twins share all of their genes and are always of the same sex.
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Because fraternal twins are conceived by two separate eggs being fertilized by two different sperm, sometimes days or even weeks apart, it is possible for fraternal twins to be fathered by sperm from two different men.
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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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In 99.9% of cases boy/girl twins are non-identical. However, in some extremely rare cases resulting from a genetic mutation, identical twins from an egg and sperm which began as male (XY) can develop into a male / female pair.
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The notion that twins always skip a generation is also a myth. The illusion may have arisen because men who inherit the gene from their mothers are unaffected by it ( they do not ovulate), but can still pass it on to their daughters, who, in turn, will have an increased likelihood of conceiving twins.
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Chromosomes from the father's sperm determine gender: XX for a girl and XY for a boy. 2﻿ As a result, the chances of fraternal twins resulting in boys, girls, or a combination are the same as for any other baby. Monozygotic—identical—twins, on the other hand, are always the same gender, either two girls or two boys.
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Fraternal twins develop when two separate egg cells get fertilized by two separate sperm cells. On the other hand, paternal twins develop when one sperm fertilizes one egg. Paternal and fraternal twins are also known as monozygotic and dizygotic 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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Twins Can Be Conceived at Different Times If an egg is fertilized by sperm from one man, and then another egg is fertilized by sperm from another man, the result is fraternal twins with different fathers. This phenomenon is called superfecundation.
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Just the two of us Fraternal twins are formed when two eggs meet two sperm in the womb. Each is fertilized independently, and each becomes an embryo. With identical twins, one egg is fertilized by one sperm, and the embryo splits at some later stage to become two.
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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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There are two types of twins – identical (monozygotic) and fraternal (dizygotic). To form identical twins, one fertilised egg (ovum) splits and develops two babies with exactly the same genetic information.