**If the bride's grandmother and grandfather were to walk together, the bride should ask someone to usher her single grandfather. This could be a female family member not in the wedding party (an aunt, a close cousin, etc.).
When new individuals enter a population: Genetic Drift: A change in allele frequencies of a gene pool due to chance or random events: Emigration: When individuals leave a population: Gene flow: The movement of alleles from one population to another: Mutations are one way : that new variation can be introduced into a gene pool. The bottleneck effect . is a genetic drift that occurs after an event greatly reduces the size of a population: The founder effect : is a type of genetic drift that occurs when a small number of individuals colonize a new area. Intersexual selection : this occurs when males display traits that are attractive to females: Intrasexual selection: this involves competition among males.
Genetic drift is more pronounced in small populations than in large ones Chance deviations from expected results (which cause genetic drift) occur whenever organisms engage in sexual reproduction Genetic drift usually leads to the loss of alleles and reduced genetic variability Population bottleneck: an evolutionary event that occurs when a stressful factor reduces population size greatly and eliminates some alleles from a population o Ex. disease, starvation, drought Founder effect: an ...