ANTH 1210 Lecture Notes - Lecture 16: Sickle-Cell Disease, Probability Distribution, Evolution

• School: University of Manitoba
• Department: Anthropology
• Course: ANTH 1210
• Professor: Haskel J.Greenfield

Document Summary

Largest population (mendelian): can be subdivided into smaller biological populations . Individuals able to reproduce and produce fertile offspring (who can also reproduce) Groups of genetically similar individuals living in the same geographic area, and interbreeding to a large extent only with other members of the same deme . Two sources: variation in genotypes in populations and different environmental pressures (differently affects phenotypes) . Natural selection: select against homozygote"s (ex: sickle cell anemia) . Continuous variation: expresses itself as a smooth gradient between two extremes (normal bell shape curve) - gradual change for one form to another (height, weight, skin colour) . Discontinuous variation: population divided into several, discrete and obvious groups without intermediaries (ex: human blood types, gender no variation between them) . Discontinuous variation cause by monogenic traits (one gene) . Involved relatively minor changes in the gene pool of a population (from one generation to the next) .