The twin studies have been an integral tool in distinguishing the nature versus nurture argument. Identical twins are siblings that have similar genotypes. Identical twins are the best indicator to ascertain whether biology affects psychology and traits in human beings. For instance, if one of the identical twins has dark hair, the other one will probably have dark hair. The concept of similar genes distributes itself toward the phenotype of personality as well as behavior ( Ridley, 2003 ). Additionally, the twin studies are essential because they provide a valuable source of information for both health and psychological research. The distinct relationship of the twins allows the researcher to differentiate and investigate genetic and environmental influences. One specific research seeks to determine the heritability of attitudes among twins and genetic variables that include intelligence that affects attitudes among pairs of twins. The study findings have been influential in detecting and treating numerous diseases and psychological disorders.
There are two types of twins a woman can have. The two types of twins include fraternal as well as identical twins. However, there are various differences between fraternal and identical. The monozygotic twins develop from one fertilized egg that divides into two. They share the same ova and placenta. They are genetically identical, share similar conception, uterus, same birth date, and cultural history. On the other hand, fraternal or dizygotic twins are conceived of two different ova and sperm. Fraternal twins also have separate placenta and sacs within which they grow. As much as they share the prenatal environment, they are genetically dissimilar and are more of brothers and sisters. The differences in fraternal and identical twins are important from the medical perspective because the difference is useful in examining the environmental and genetic influences on traits and disorders as well as their transmission across generations.
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Reference
Ridley, M. (2003). Nature via nurture: Genes, experience, and what makes us human. New York .
