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Because genes do not account for every trait or characteristic. Some characteristics are influenced by environment.

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10y ago

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Related Questions

Who are clones fraternal twins or identical twins?

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.


Are paternal twins identical?

I dont think there is such a thing as paternal twins...perhaps you are thinking of fraternal twins. In that case, they are not identical twins, they do not look the same and they can be different sexes.


Why are some twins identical and some not?

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.


Why wont the babies look the same if identical twins have babies with identical twins?

Because the mother identical twins each have a different husband . . . half of his characteristics show up in their babies.


Are twins born with different DNA?

Yes EVERYBODY has different DNA even if you are identical twins.


Do identical twins develop from two different eggs that are fertilized by different sperm?

No, fraternal twins do.


Why Can fraternal twins be different gender but identical twins are always the same gender?

fraternal twins have two different chromosomes


What is the name for twins that look different?

Paternal Non-Identical fraternal twins


What is the difference btween identical twins and fraternal twins?

Identical twins are the result of a single fertilized embryo splitting in two at an early stage and forming two viable embryos. As such, identical twins have identical DNA. Fraternal twins are the result of two distinct fertilized embryos being viable. As such, they have different DNA. They could even be different sexes.


What would distinguish even an identical twin from its sibling?

Fingerprints are different in identical twins.


If twins aren't identical what are they called?

Twins who are of the opposite sex or do not look alike are fraternal twins ~ not identical. This means that at the time of their conception ~ two eggs were fertilised. In the case od identical twins, one egg is fertilised and split in half.


What do you call identical twins that develop from two different eggs that are fertilized by different sperm?

That isn't possible: if the twins are from two different eggs, fertilized by different sperm, then they will not be identical. It's genetically impossible.