Mutation of the DNA creates new alleles.Interbreeding between different populations creates genetic diversity because there is gene flow i.e. alleles are transferred between the two populations. If the number of alleles decreases, biodiversity decreases.Selective breeding and natural selection can reduce biodiversity.Genetic bottlenecks where a few individuals of a population survive will reduce the gene pool. The founder effect, where a small number of individuals create a new colony geographically isolated from other colonies.
Genetic drift is the chance disappearance of an alleles from a population. This is more pronounced if biodiversity is low.
Genetic drift is the chance disappearance of an alleles from a population. This is more pronounced if biodiversity is low.