Considering that identical twins develop from a single fertilized egg, analyze the potential reasons for the significant difference in the psychological outcomes described in the case study below.

Analyzing Divergent Outcomes in Twins

Identical twins originate from a single fertilized egg that splits, meaning they share the exact same genetic material. Despite having identical genes, there is incredible variability in how their gene expression unfolds throughout their lives. For example, one identical twin might develop a disease, such as cancer, while the other does not. Although they possess identical genotypes, their unique environmental interactions over time lead to different epigenetic expressions and differing phenotypes.

Example of Epigenetics in Identical Twins

A type of twins that develop from a split single fertilized egg in which each twin shares the exact same genetic material as the other. 

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A type of research involving twins to assess the relative contributions of heredity and environment to a given behavioral trait. They often compare identical and fraternal twins and twins raised together or apart. 

Twin Studies

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

Identical Twins

A type of twins that usually develop from two different eggs fertilized by different sperm in which the genetic materials of the twins vary, similar to non-twin siblings.

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