Monozygotic twins.
What are Monozygotic twins?
Identical twins, also known as monozygotic (MZ) twins, develop when a single egg cell is fertilized by a single sperm cell. Very early in its development, the resulting zygote splits in two, resulting in the production of two distinct embryos. Globally, 3 to 4 MZ twins are born out of every 1,000 births. According to research, genetic factors do not account for the majority of cases of MZ twinning. However, a small number of families with a higher-than-expected number of MZ twins have been documented, suggesting that genetics may be involved. Although this theory has not been proven, it is conceivable that genes that cause cells to adhere to one another cell adhesion may be a factor in MZ twinning. MZ twinning frequently has an underlying etiology that is unclear.
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