what are two possible sources of this genetic variation?
52959
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
1368890
Mutation. Although mutation is the original source of all genetic variation, mutation rate for most organisms is pretty low. ... (However, natural selection acting on the results of a mutation can be a powerful mechanism of evolution!) Non-random mating.
706653
Genetic Variation and Evolution. Genetic variation is the substrate of evolution. Examining the genetic differences between individuals of the same species, as well as comparing the genomes of different species, can tell us a great deal about the relationships between organisms.
941616
“Common Obesity” Caused by Mutations in Multiple Genes Evidence from animal models, human linkage studies, twin studies, and association studies of large populations suggests that this variation in our susceptibility to obesity has a genetic component.
1333163
['Crossing over (in prophase I)', 'Random assortment of chromosomes (in metaphase I)', 'Random fusion of gametes from different parents.']
1049244
['Environmental changes.', 'Cultural/mating preferences.', 'Population Immigration.', 'Genetic Mutation.']
320936
Several studies have indicated that LV mass is influenced by genetic factors. The substantial heritability (h2) for LV mass in population-based samples of varying ethnicity indicates robust genetic influences on LV hypertrophy.
98271
Population size is considered to be important to the maintenance of genetic variation. Population genetic theory predicts that, as a consequence of genetic drift and/or inbreeding, small populations should show lower levels of genetic variability than large populations (Hartl and Clark, 1997).
242780
Key Points Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
1026940
['mutation.', 'random mating between organisms.', 'random fertilization.', 'crossing over (or recombination) between chromatids of homologous chromosomes during meiosis.']
1001056
Meiosis also produces genetic variation by way of the process of recombination. Later, this variation is increased even further when two gametes unite during fertilization, thereby creating offspring with unique combinations of DNA.
342429
Genetic variation is increased by meiosis Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote. Recombination or crossing over occurs during prophase I.
829512
There are four forces of evolution: mutation, gene flow, genetic drift, and natural selection. Mutation creates new genetic variation in a gene pool. Gene flow and genetic drift alter allele frequencies in a gene pool.
478186
Genetic variation is increased by meiosis Because of recombination and independent assortment in meiosis, each gamete contains a different set of DNA. This produces a unique combination of genes in the resulting zygote.
954813
Typically, mutations increase genetic diversity; the other three processes reduce it. Natural selection and genetic drift tend to enhance genetic differences among populations; migration tends to homogenize genetic difference, decreasing the differences among populations.
213516
Genetic variation is the difference in DNA among individuals. There are multiple sources of genetic variation, including mutation and genetic recombination.
107756
['Genetic Contamination/Interbreeding. ... ', 'Competition with Natural Species. ... ', 'Increased Selection Pressure on Target and Nontarget Organisms. ... ', 'Ecosystem Impacts. ... ', 'Impossibility of Followup.']