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Asked by dtdebbie8 - 4 years ago
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kdolls1 Level 9 / sec, estimator
Answered 4 years ago
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Truthfully I think it is the female. I know the male determines sec, anyone? If I am wrong, please correct me
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WannKnow Level 38 / L.P.N.,B.A.,B.S.
Answered 4 years ago
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Twins are the direct result of the mother to produce more than one ovum, or for the ovum to split into two halves creating identical copies. It is a hereditary factor also. Gender is the result of the father's Y chromosome only, the female only has X chromosomes.
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kc5255 Level 38 / Out of the Workforce
Answered 4 years ago
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How Twins are Formed

Identical twins are caused by one egg being fertilized by one sperm. Sometime after fertilization, the egg splits into two genetically identical halves. Identical twins are always of the same sex. They share 100% of their genes, and are in reality, natural clones.

Fraternal twins are formed when two eggs are released by the mother, and each egg is fertilized by a different sperm. Fraternal twins can be of the same or opposite sex. They share up to 50% of their genes, and are no more alike or different than any two siblings would be. It is also possible for fraternals to be of different races or parentage, or to be conceived at different times, resulting in a large weight difference at birth.

There is a third type of twinning that scientists are looking into, called polar body twinning, or "half identical" twinning. This occurs when the mother's egg splits before fertilization and then each half is then fertilized by a sperm. This may explain why some fraternal twins (such as the Olsen twins) look as alike as some identicals, but it hasn't been proven that it occurs, or that it would produce viable twins.

Conjoined twins form exactly like identical twins, but at some point during the stage where the single egg splits, the process stops, and the twins develop attached to one another. This occurs in about 1 out every 100,000 to 200,000 live births, but 60% of conjoined twins are either stillborn or lost in utero. Females are conjoined more than males, at a ratio of 3:1, and they are more likely to occur in India or Africa than China and the USA.
Additional Details added 4 years ago
Boy/Girl Identicals

There has been very rare cases (about 3 I have found), of opposite sex identical twins because of genetic abnormality. In these rare cases, identical boys would be conceived and one twin, during the twinning process, loses a Y chromosome (boys have chromosome type XY while girls have XX), creating a girl by default, but a girl with only one X chromosome (chromosome type XO). The girl will suffer from Turner's Syndrome, which is distinguishable by their short stature, folds of skin at the neck, abnormal development of secondary sexual characteristics, an intellectual deficit known as space-form blindness. The male co-twin would be unaffected. Turner's syndrome can occur in any birth, even that of fraternal female twins, or identical female twins. It also occurs in single births, so an individual with Turner's syndrome is not automatically a twin. Turner's Syndrome occurs in about 1 in 10,000 of all births.
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PacoPuddy Level 10
Answered 4 years ago
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Some brilliant answers here, but when push comes to shove, it can be either parent which causes twinning.

Where the twins are non-identical, ie produced from two seperate eggs, the mother is responsible, as she has simultaneously produced two eggs when ovulating.

Where the twins are identical, ie where a single egg splits into two after fertilisation, either parent can carry the characteristic which encourages splitting - as Wannknow has said, there is an hereditary factor involved here.

This is why insurance companies like to know if there are incidences of twins on either side of the family when they calculate their premiums if you insure against having twins.
kattmanndawg Level 25 / Here's My 2ยข Worth..
Answered 4 years ago
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In my opinion, the doctor determines that (after all their the first to identify and confirm the pregnancy lol)...
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