Answer :
To determine how much a particular attribute is influenced by genetics and the environment, monozygotic (MZ, or identical) twins and dizygotic (DZ, or fraternal) twins are compared.
What are the genetic similarities between monozygotic and dizygotic twins?
The genetic makeup of monozygotic twins is substantially identical. It is assumed that an underlying genetic component contributes to the higher phenotypic concordance between monozygotic twin pairs compared to dizygotic couples.
Monozygotic: One egg produces identical twins, also known as monozygosity. When two eggs are fertilised, fraternal twins are produced.
In contrast to dizygotic (fraternal) twins, who share only approximately 50% of their DNA, or the same amount as nontwin siblings, monozygotic (identical) twins are thought to arise from a single egg fertilised by a single sperm, which separates as the egg begins to mature.
The same genes and sex are always shared by identical twins. Fraternal (dizygotic) twins, on the other hand, are created when two distinct eggs are fertilised by two different sperm during the same reproductive cycle.
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