Psychology 1000 Lecture Notes - Lecture 10: Twin, Genetic Disorder, Heritability

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Dr.Mike

Document Summary

Next time: evolution & behaviour - scan: finish chapter 4. Alleles can be homozygous and heterozygous. Polygenetic effects traits related to action of more than 1 gene or chromosome. Heritability formula: h2 = variance due to genes/total variance: this can vary from 0 and. 1, (0 is due to environment, 1 is due to genes) For hair colour, h2 = 0, but genes are responsible for expression of hair colour. Hair colour is determined by genetics, but it depends on the environment (different hair colour in different places) H2 = decreases as environmental diversity increases. Heritability of intelligence: family relationship studies (from last lecture notes) Coincidences (look these people up, they are interesting people) Consider jim lewis & jim springer, and oskar stohr & jack yufe. 1869 relatives of intelligent people also intelligent; He measures simple motor and sensory abilities. Believes that intelligence was unitary (mental quickness) Develops correlation coefficient; results were disappointing (still believed that intelligence is heritable)