TRUE The frequency of dizygotic twinning varies between ethnic groups and appears to be heritable. Monozygotic twinning happens to all ethnic groups equally and is not heritable.
In general, dizygotic twins resemble one another more than monozygotic twins. Dizygotic twins, on average, have 50% of their genes in common, whereas monozygotic twins have 100% of their genes in common.
One fertilized egg (ovum), which develops into two children with the same genetic makeup, produces identical or monozygotic twins. Two eggs (ova) are fertilized by two sperm to create fraternal or dizygotic twins, which are two genetically distinct infants.
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