**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.
A population bottleneck arises when a significant number of individuals in a population die or are otherwise prevented from breeding, resulting in a drastic decrease in the size of the population. Genetic drift can result in the loss of rare alleles, and can decrease the size of the gene pool.Genetic drift can also cause a new population to be genetically distinct from its original population, which has led to the hypothesis that genetic drift plays a role in the evolution of new species. population bottleneck arises when a significant number of individuals in a population die or are otherwise prevented from breeding, resulting in a drastic decrease in the size of the population. Genetic drift can result in the loss of rare alleles, and can decrease the size of the gene pool.