PSYC 100 Lecture Notes - Lecture 3: Y Chromosome, Twin, Chromosome

• School: Queen's University
• Department: Psychology
• Course: PSYC 100
• Professor: Caroline F Pukall

Document Summary

If not, heterozygous: the two genes at a given locus are called alleles, one allele inherited from father, the other from the mother. Monozygotic and dizygotic twins: most understanding of genes" effects on behaviour comes from studies examining relationship between genetic similarity and similarity in some trait. If characteristic is more similar between mz than dz twins, genes probably play a role: some studies have examined mz and dz twins raised in different environments. Genotype and phenotype: genotype: genetic makeup of a trait, phenotype: how the trait is expressed, recessive traits show up phenotypically in subsequent generations when an organism carrying the recessive trait breeds with another one carrying the recessive trait. Single gene traits: most behaviours, like most other factors, are caused by the interaction of multiple genes with the environment. This raises the (very controversial) possibility that an acquired characteristic could be inherited by offspring.