Using this information, handedness is expected to have a large genetic influence.
Identical twins (also known as monozygotic twins) are the result of a single egg being fertilized by a single sperm, with the fertilized egg splitting into two. Identical twins have identical genomes and are always of the same gender. Monozygotic twins are created by combining one sperm and one egg. Dizygotic twins are born from the union of two sperm and two eggs.
MZ twins, also known as identical twins, are formed when a single egg cell is fertilized by a single sperm cell. Early in development, the resulting zygote splits into two, resulting in the formation of two separate embryos.
The concordance value for handedness in monozygotic twins is 79%; in dizygotic twins, the value is 77%. This information points to a significant environmental contribution to the observed phenotypic variation in human handedness.
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