Genetics
Probability
Multiple Births

How can one have identical twins?

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2007-08-10 23:18:04
2007-08-10 23:18:04

There are two primary types of twins, Identical and Fraternal.

Identical twins occur when the egg splits after fertilization. To date no indication of a genetic link has been found. Anyone has a chance, though small, of having identical twins.

Fraternal twins occur when more than one egg is dropped during ovulation. This trait can be inherited from the mother's side of the family. Studies have shown that the chances are also increased by being overweight or older.

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Related Questions


Identical twins are formed when one fertilized eggs splits. Non-identical twins are formed when two separate eggs are fertilized.


Yes, they have 2 sets of twins, one is fraternal and one is identical. The identical set is John David and Jana.


No. Identical twins are identical. Fraternal twins are not.


With identical twins, a fertilized egg splits in two. With non-identical twins, more than one egg is fertilized.


Twins are not necessarily identical. They can be fraternal as well. Identical twins result when one fertilized egg splits in two. Fraternal twins result from two fertilized eggs.


Identical twins come from one egg and one sperm. Fraternal twins come from two eggs and two sperm.


Identical twins come from the division of one egg.


Identical twins, due to the fact that the one fertilized egg splits, have identical DNA. Fraternal twins, since they are from separate eggs, have different DNA.


In identical twins, the DNA is identical, which is what makes them identical. In Fraternal twins it is not.


Identical twins originate as one fertilized ovum which divides into two identical ova.


Some twins are identical twins, other are not identical twins. Identical twins develop from a single fertilized egg that subsequently splits into two zygotes. Non-identical twins, also called fraternal twins, develop from two different fertilized eggs.


Well the chances are unknown to me but theres a one in a million chance that you might have identical twins. Identical twins are rare in some cases. Hopefully you have an identical twin if you want one.


Although there can be the usual resemblance of a family, they cannot be both "identical" twins and different genders.


Identical twins have to be the same sex because they both come from one egg. This means that they have identical genetic material, and therefore identical chromosomes.


If two eggs are fertilsed you get fraternal twins whereas if one egg is fertilised and that develops into two individuals, you get identical twins.


Twins are identical because they come from the same egg.


The difference between Identical and Non-Identical twins is that Identical twins share the same placenta and are basically identical to one another. Non-Identical twins do not share the same placenta in the womb and two eggs fertilized at time of conception as opposed to one egg splitting in the case of Identical twins. I think that covers the basics. Hope this has clarified things for you.


Identical (monozygotic) twins develop from one zygote (fertilized egg) that splits into two embryos.


Well, as an identical twin myself, I believe there is a one out of twelve chance of having identical twins, although, I'm not 100% sure....


If they were not then they would not be called identical twins!


The genes of identical twins are identical because the twins come from one egg that has split after fertilization. Fraternal twins are not identical since they come from two eggs but have occupied the mother's womb at the same time.


Yes, they are identical twins, monozygotic twins, born ten minutes apart. They share the same genome, they are identical genetically, they are identical twins.


The reason why some twins are identical and some are not starts in utero. Identical twins occur when one egg is fertilized and it splits to create two embryos. Nonidentical twins come from different fertilized eggs.


Identical twins are created when 1 eggs splits into 2. Conjoined twins are the result of identical twins not separating all the way.


Not necessarily you could be having twins and they don't have to be identical.



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