AP BIOLOGY

Detailed explanation-1: -Which of the following events do biologists consider a random change? the founder effect.

Detailed explanation-2: -Genetic drift is the change in frequency of an existing gene variant in the population due to random chance. Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation. It could also cause initially rare alleles to become much more frequent, and even fixed.

Detailed explanation-3: -Mutation, a driving force of evolution, is a random change in an organism’s genetic makeup, which influences the population’s gene pool. It is a change in the nature of the DNA in one or more chromosomes. Mutations give rise to new alleles; therefore, they are a source of genetic variation in a population.

Detailed explanation-4: -Genetic drift is common after population bottlenecks, which are events that drastically decrease the size of a population. In these cases, genetic drift can result in the loss of rare alleles and decrease the gene pool.

Detailed explanation-5: -Answer and Explanation: The most common event that results from genetic drift is the population bottleneck which causes drastic changes in allele frequency in a very short period due to any random event.