PSY100H1 Chapter 3: Chapter 3 notes
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PSY100H1 Full Course Notes
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Twin studies compare similarities between different types of twins to determine the genetic basis of specific traits. Monozygotic twins a. k. a. identical twins, are the result of one zygote dividing into two, each having the same chromosomes and the genes they contain. Dizygotic twins a. k. a. fraternal or non-identical twins, are the result of two separately fertilized eggs and are no more related than any other pair of siblings. The process of fertilization occurs separately to produce the two zygote, which then develop independently: adoption studies compare the similarities between biological relatives and adoptive relatives. Adopted siblings have similar home environments but different genes. Refers to differences in a certain trait among individual, not the trait itself.
