**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.
Founder effects. A founder effect occurs when a new colony is started by a few members of the original population. This small population size means that the colony may have: 1  reduced genetic variation from the original population. 2  a non-random sample of the genes in the original population.ottlenecks and Founder Effects. Genetic drift can cause big losses of genetic variation for small populations. Population bottlenecks occur when a populations size is reduced for at least one generation.