A family has a set of twins, one boy and one girl. Which of the following statements most accurately describes their genetic makeup?

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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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

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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