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There really isn't a 'gene' for twins. However, fraternal twins are the result of a woman releasing two eggs at a time. This trait can run in the womens side of the family so there is more chance her daughters will release 2 eggs at a time. To date there is no indication that identical twins have any genetic markers. All women have a chance of having their eggs split and having identical twins.
A doctor can tell you or when you give birth to them you would know. Fraternal twins is two separate eggs from the ovaries get fertilised.
Where one cell splits into 2 or 3 durning the early age of pregnancy
Two separate eggs are fertilized. Dizygotic twins are the same as fraternal twins.
Identical twins are formed when one fertilized eggs splits. Non-identical twins are formed when two separate eggs are fertilized.
two separate and distinct eggs are fertilized at the same time growing in the womb together, but having different DNA.
Having sex is a good way to start to conceive. However, conception of twins depends on the splitting of the egg, or upon several eggs being produced at once. Twins often run in families, leading to the strong possibility that the conception of twins is a genetic feature more than happenstance.
Absolutely not ! The only way for a woman to bear twins is if either there are two eggs implanted after conception (non-identical twins) or one egg develops into two embryos (identical twins)
Identical twins are 100% random, and fraternal twins (two eggs, two sperm) only have to do with the mom's genetics (the one who drops both eggs). The father really has nothing to do with making twins.
If two eggs are fertilized, the offspring will be twins. The twins could be two males, two females, or one of each.
Twins from different eggs are fraternal twins. They are siblings with the same birthdate. They are twins, but not identical, and can even be girl and boy. It is the same process taking place as a single child that a woman becomes pregnant with, but the process happens with two children at the same time. The woman releases two eggs that month instead of one, and they both are fertilized. That is how this type of twin is produced.
Identical twins are formed from a single egg that splits into two. Fraternal twins are formed from two separate eggs that are both separately fertilized. So identical twins have identical DNA, and fraternal twins do not.