Monozygotic

the same genetic structure. They came out with the hypothesis that if the environment is responsible for individual differences, then MZT twins who shared the same environment should be significantly more similar than MZA twins. They are called monozygotic twins because they start as a fertilized egg, called a zygote, and then split into two identical embryos. Fraternal twins are the result of two separate eggs fertilized by two separate sperm cells and are referred to as dizygotic twins.…

One of the first studies on testing homosexuality using twins was in 1952 by Frantz Kallman. Kallman’s study had 85 sets of twins. 40 sets out of 85 sets of those twins were monozygotic (identical twins) and the other 45 sets of twin were dizygotic (not identical twins). This study also included 112 individuals who were not twins but were homosexual and it also included 116 employees from Kallman psychiatric institute. All of the homosexual people either came from his psychiatric institutions or…

the nature versus nurture argument. Pros of twin studies are that identical twins otherwise known as monozygotic twins have genotypes that are identical to each other. Therefore, monozygotic twins are the best indicator of whether biology is the main effector of behavior and psychopathology. Not only are the genotypes identical in monozygotic twins, but they…

If both parents have alcoholism, will their children have alcoholism, too (nature vs nurture)? If both parents have alcoholism, it does not necessarily mean that their children will have alcoholism. Inherited biochemistry affects alcohol metabolism. There is no specific gene for alcoholism. However, the alleles that make alcoholism have been identified on every chromosome except the Y. Each individual is different, they're reaction to alcohol may be different from others. Both parents metabolism…

Nature verses Nurture Nature and nurture is sometimes looked at as a dichotomy. In this paper I will provide multiple reasons why I do not feel this is accurate. The nature and nurture controversy pertains to whether biology, genes, evolution, etc. (nature) explain ones behavior and development or does ones environment, experience, caregivers, etc. (nurture) explain ones behavior and development. However, both are valid when trying to discern the major influences ones development. In professor…

In a study conducted by Kaminsky, Zachary, et al. the purpose was to determine if microarray-based epigenetic profiling done on a set of monozygotic twins could reliably detect any differences in DNA methylation. They also used several different psychometric tests to determine any major psychological differences between the set of twins and gathered a detail history from each twin to determine…

Prevalences of major depression were comparable across the various studies which also meant that the prevalences amongst monozygotic and dizygotic twins were parallel. The information was alike across ascertainment methods and sex (Sullivan, Neale & Kendler, 2000). The tested these assumptions by using the likelihood ratio chi-square difference test. There was a comparison of…

personality. Psychological research that quintessentially illustrates this notion is the Minnesota Twin Study. This psychological study assessed 402 sets of twins, both monozygotic and dizygotic, in which some had been reared together and others apart (Grivas and Carter, 2010). Despite having been reared separately, these sets of monozygotic twins were still alike and displayed high correlations on nearly every personality trait that had been investigated. (Grivas and Carter, 2010). Furthermore,…

In child development there is much debate about if a child's intelligence level is inherited from their parents or as a result of their environment, leading psychologists back to the nature vs nurture debate. Some psychologist's believe that intelligence level are genetically determined and inherited from their parents supporting the nature argument in the debate. There has been many studies conducted to support this over the last generation. One of the most noted studies was a twin study…

is a replication of Bandura et al.’s Bobo doll study. Twin pairs were encouraged to act aggressively towards the doll by being exposed to an adult model who acted aggressively towards it. Researchers found no difference in correlations between monozygotic and dizygotic twin pairs, suggesting that individual differences in aggression were more a product of environmental influences for example a family upbringing, rather than genetic…