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

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

Document Summary

Dna is organized into structures called chromosomes that are in the nucleus of every cell. Chromosomes come in pairs, with half of each pair contributed by one parent. 22 of them are called autosomes and the 23rd pair is made up of the x and y sex chromosomes. Almost all males have an xy pair. Genes are regions of the chromosomes that encode proteins. A gene locus is the point on the chromosome where a particular gene is located. When genes at the same locus are the same, they are homozygous. Homozygous: each parent contributes different alleles for a particular gene. 2 genes at a given locus are called alleles. One is inherited from the mother and the other room the father. If alleles are heterozygous one has a dominant effect over the other. Alleles: alternative forms of the same gene. Example: the allele for the blue eye colour is recessive.