Genetic Heritability: The extent to which traits or characteristics can be attributed to genetics. It indicates how much variation in a trait is due to genetic differences among individuals.
Monozygotic Twins: Also known as identical twins, they develop from a single fertilized egg that splits into two embryos. They share the same genetic makeup.
Dizygotic Twins: Also known as fraternal twins, they result from two separate eggs being fertilized by different sperm cells. They share about half of their genes on average, like regular siblings.