BIOL-123.03 Study Guide - Population Bottleneck, Genetic Drift, Genetic Variation
Document Summary
Study guide exam #2: core concept: evolution (ch. Evolution - change in allele frequency in a population over time. Natural selection - adaptive mechanism by which evolution takes place and is often summarized as differential survival and reproduction. Origins of giraffes long necks, evolved in length in order to reach plants fruits on high trees. Gene flow - the movement and incorporation of alleles from one population to another. Green beetle from one population moving to another population of blue beetles to create variation. Genetic drift - founder effect - the accumulation of changes in the genetic makeup of a population over time due to random events. Small number of individuals from the original population start a new colony usually in a new location. Bottleneck - a population"s size is reduced for at least one generation at a time. Original population bottleneck event surviving population. Biological factors (predation, parasitism, competition, and disease)
