Twin studies are research designs used in psychology to measure the influence of genetic factors on human behavior by comparing identical (monozygotic) twins with fraternal (dizygotic) twins.
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Monozygotic Twins: Identical twins who develop from one zygote that splits into two embryos; they share 100% of their genes.
Dizygotic Twins: Also known as fraternal twins; they develop from two separate eggs fertilized by two separate sperm cells; they share about 50% of their genes just like any other siblings born separately.