Psychology 3228 Chapter Notes - Chapter 2: Homo Erectus, Australopithecus, Chromosome

• School: Western University
• Department: Psychology
• Course: Psychology 3228
• Professor: Scott Mac Dougall- Shackleton

Document Summary

Artificial selection: have been selected not by nature but by human beings. Many organisms are the way they are today because their traits. Proposed by darwin who used artificial selection as evidence. Individuals that happen to have genetically influenced advantageous characteristics in a given environment will be favoured" in terms of the number of surviving offspring they produce. Three sources of variation: mendelian variation due to the mixing together of parental genes, recombination genes are exchanged between chromosomes. The closer together two genes are found on a chromosome, the more likely they are to be passed on together during recombination. The degree of linkage (the likelihood of genes being passed on together) is an indication of how close their loci are on a chromosome. Individual genes may also be subject to mutations but these are rare compared with chromosome mutations. The vast majority of these are .