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Do twins have the same dna?

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John McCann Profile
John McCann answered

Essentially so ( monozygotic twins ) as they are the result of zygotic splitting in the womb.

Still development can alter the genome somewhat so that these twins are close to but not quite clones.

Tamara Watson Profile
Tamara Watson , Tamara Watson born in Florida, USA. After studying chemistry at Miami Dade College (Miami), she became a fellow of the college. , answered

It depends upon whether the twins are monozygotic or dizygotic. If they are monozygotic, then many genes are going to be identical in the twins. But in case of dizygotic twins, the possibility of identical genes will not be more frequent like monozygotic twins.

This thing is responsible for many genetic disorders like autism. That's why genes responsible for autism are found in siblings.

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