What is the probability of siblings to be identical in separate births?

Question

Can two children born to the same parents in different birth be identical? if yes what is the probability ?

Answer 1

It is so close to zero as to be negligible. There are 22 pairs of autosomes in DNA, so the probability of a match in two siblings is on the order of 2^-22, or one part in about four million. And that does not even count the mitochrondrial genetics.

Answer 2

Are there different types of twins?

Twins are of two basic types – identical and fraternal or non-identical. Identical twins are formed when one fertilised egg splits into two at some time during early pregnancy. Fraternal twins are born when two separate eggs are fertilised by two separate sperms. Identical twins are also called monozygotic while fraternal twins are known as dizygotic. Fraternal twins usually develop in separate amniotic sacs and have separate placentas. Identical twins share the same amniotic sac but have separate placentas.

Identical twins:
Identical twins are born when the fertilised egg splits into two distinct entities in the early stages of cell division. The DNA and other genetic material is shared by the twins. Identical twins have the same genotype and phenotype which means that they not only have a similar genetic make up but also look similar from the outside. Identical twins are always of the same sex.

Siamese or conjoined twins:
A variation of identical twins, these twins are joined at one or the other body part. This is because of incomplete splitting of the fertilised egg during pregnancy leading to incompletely separated individuals. Siamese twins, like identical twins look alike and are of the same sex. However, conjoined twins are joined at some point in their bodies and may also share some organs. Conjoined twins have been known to be joined from the head, chest, stomach and hips.

Mirror twins:
Another variation of identical twinning, these twins are mirror images of each other. They are extremely rare. Such twins have organs on the opposite sides, for eg., one twin will have the heart on the right side instead of the left and will be opposite handed to the other twin.

Fraternal twins:
The most commonly occurring twins, fraternal twins are no more alike – genetically and phenotypically, than any regular pair of siblings. Fraternal twins are formed when two separate eggs are fertilised by two different sperms. They share only the uterine space and the intra-uterine environment. Fraternals may not be of the same sex and they may also not look alike.

Answer 3

The only way for two children to be identical is if they are from the same fertilized egg, and that one egg splits in two. Since family DNA is so close, the odds are pretty good that two children of the same parent, who were born at different times may have a lot of similarities.

Answer 4

none, zero. Identical twins are from one fertilized egg, with one sperm, that during development, divides, usually totally. ( When it fails, they are conjoined twins.) Identical twins are ablolutely and positively identically genetically--- they can transplan kidneys and anything else with no tissue rejection......Theoretically, one of the divided eggs could be extracted from the uterus, frozen, and re-implanted,into the same woman or even into another woman at a later date.

Answer 5

For all intents and purposes, impossible.

There are 30,000 different genes.

Each sperm and egg each holds 15,000

15,000 randomly selected out of 30,000


30,000! / 15,000!

then add in the enviroment (weather, nutrition, treatment, thoughts) and it is practically impossible

Answer 6

null. children in same family share roughly 50% same DNA. yhey may resemble one another, but never identicle

Answer 7

I think Devinthedragon has given your answer in its correct context, give him best answer