what are the 2 main sources of genetic variation in a population?
167536
For a given population, there are three sources of variation: mutation, recombination, and immigration of genes. However, recombination by itself does not produce variation unless alleles are segregating already at different loci; otherwise there is nothing to recombine.
1029351
Genetics is the study of the genetic composition, heredity, and variation of organisms. There are three major branches of genetics: classical genetics, molecular genetics and population/evolutionary genetics.
925227
['Population − It is a subset of all the possible (encoded) solutions to the given problem. ... ', 'Chromosomes − A chromosome is one such solution to the given problem.', 'Gene − A gene is one element position of a chromosome.', 'Allele − It is the value a gene takes for a particular chromosome.']
213516
Genetic variation is the difference in DNA among individuals. There are multiple sources of genetic variation, including mutation and genetic recombination.
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.
136186
Genetic variation is an important force in evolution as it allows natural selection to increase or decrease frequency of alleles already in the population.
546008
Genetic variation is the difference in DNA sequences between individuals within a population. ... Only variation that arises in germ cells can be inherited from one individual to another and so affect population dynamics, and ultimately evolution. Mutations and recombination are major sources of variation.
584070
Natural selection, genetic drift, and gene flow are the mechanisms that cause changes in allele frequencies over time. When one or more of these forces are acting in a population, the population violates the Hardy-Weinberg assumptions, and evolution occurs.
1247154
['Describe the four basic causes of evolution: natural selection, mutation, genetic drift, and gene flow.', 'Explain how each evolutionary force can influence the allele frequencies of a population.']
1049244
['Environmental changes.', 'Cultural/mating preferences.', 'Population Immigration.', 'Genetic Mutation.']
370687
['produces genetic variation in the offspring.', 'the species can adapt to new environments due to variation, which gives them a survival advantage.', 'a disease is less likely to affect all the individuals in a population.']
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.
980633
Putting it very briefly, evolutionary genomics is using DNA information to make inferences about population history and differentiation between species. Population genetics is more focused on the dynamics of populations within a species.
505847
['overproduction. more offspring can be produced than can survive to maturity.', 'genetic variation. within a population, individuals have different traits and the traits can be inherited.', 'struggle to survive. compete for food and shelter.', 'Differential reproduction.']
887925
['Non-adaptive traits. -vestigial traits. ... ', 'Genetic constraints. -gene linkage (no crossover possible; indirect selection due to proximity to selected genes) ... ', 'fitness trade-offs. ... ', 'historical constraints.']
86499
In sexually reproducing organisms other than prokaryotes, meiosis and fertilization are the two common ways which leads to genetic variation in population. So in bacterial population (prokaryotes), meiosis and fertilization will not occur to result genetic variation in them.
694935
Neutral alleles are neither selected for nor against and usually remain in the population. Genetic variation is advantageous because it enables some individuals and, therefore, a population, to survive despite a changing environment.