PSYC 100 Lecture 3: week 3 notes

• School: Queen's University
• Department: Psychology
• Course: PSYC 100
• Professor: Jordan Poppenk

Document Summary

Understanding the basis of genetics allows psychologists to better understand the relationship between genetics and behaviours, as well as disorders and diseases. This arises the nature (nativists) vs nurture (empiricists) debate. Genes, dna, and chromosomes: humans have 23 pairs of chromosomes, half of which come from the mother and the other half from the father. The 23rd pair is the sex chromosome, making a female with an xx pair, or male with a xy pair. When two alleles arrive at their locus and they are the same, they are homozygous: if each gene has a different allele they are heterozygous, if alleles are different, heterozygous, then one must mask the other. This will be the dominant allele that mask the recessive: recessive trait is only apparent when both alleles are recessive, a genotype is a persons speci c genetic makeup, a phenotype is the physical expressed feature. Blue eyes is recessive represented with lower case b.