Identical twins have identical DNA, and blood type, and are usually always the same gender.
The term identical twins make reference to monozygotic twins, i.e., twins produced from the same zygote.
The zygote is a cell that generates during fertilization, i.e., by the fusion of a sperm cell and an egg cell.
The monozygotic twins have the same DNA because they were formed from the same sperm and egg cells.
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