PSYC325 Lecture Notes - Lecture 2: Twin, Twin Study, Selective Breeding

• School: University of Delaware
• Department: Psychology
• Course: PSYC325
• Professor: Hubbard Julie

Document Summary

Chromosomes and genes: 1 cell zygote with 23 pairs of chromosomes. Mitosis: mainly done by body cells (make up everything in your body except sperm and eggs) Meiosis: specifically done by sperm and eggs. Monozygotic and dizygotic twins: monozygotic are identical twins, come from one zygote that splits in 2 before beginning mitosis, dizygotic twins are fraternal, separate eggs and separate sperm, on average share about 50% of their genetic material. Sex determination: 23rd pair determines males have xy and females have xx. Gene expression: dominant-recessive inheritance, only determined by one pair of genes, sex-linked inheritance. Inheritances that depend on the x or y chromosomes. If one twin has the trait, what is the percentage likelihood that the other twin will have it too. Hereditary influences on personality, behavior, and mental health: hereditary influences on empathy, zahn-wasler. Impact of environment depends on genetics: b&g mice with handling.