![]() ![]() Higher population genetic diversity in the abundant species is likely due to a combination of demographic factors, including larger local population sizes (and presumably effective population sizes), faster generation times and high rates of gene flow with other populations. Our results were consistent with the predictions of neutral theory, as the abundant species almost always had higher levels of haplotype diversity than the less common species. We assessed population genetic diversity at three protein-coding loci for each species. We compared populations of zebra-tailed lizards and western banded geckos, which are abundant and short-lived, to chuckwallas and desert iguanas, which are less common and long-lived. Independent assortment during meiosis increases variation because it results in genetically different gametes. Down syndrome) or the structure of a gene (e.g. Mutations are random changes in the number of chromosomes (e.g. By sampling related species from a single geographic location, we aimed to reduce nuisance variance in genetic diversity owing to species differences, for example, in mutation rates or historical biogeography. Genetic variation exists because of changes to chromosomes or genes (DNA). The goal of this study was to measure genetic diversity among sympatric populations of related lizard species that differ in population size and other ecological factors. However, the lack of compelling evidence for a relationship between genetic diversity and population size in comparative studies has generated some skepticism over the degree that neutral sequence evolution drives overall patterns of diversity. Neutral theory posits that genetic diversity will increase with a larger effective population size and the decreasing effects of drift. Nonetheless, the forces that maintain patterns of genetic variation in wild populations are not completely understood. Genetic diversity is a fundamental requirement for evolution and adaptation. Biology questions and answers In a metapopulation, does genetic flow (also known as migration) increase or decrease the amount of genetic variation within local populations Does genetic flow between populations increase or decrease allelic differences between local populations Explain your answers. ![]()
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