Answer :
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 children. Twin studies make it possible to separate the shared genetic and environmental factors that contribute to the desired trait. Researchers can calculate how much of a trait's variance is due to genetic variation versus how much is due to shared or unshared environments. Identical twins, also known as monozygotic twins, are produced when a single egg is fertilized by a single sperm, resulting in the fertilized egg splitting into two. Identical twins always have the same sex and have the same genome.
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