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11.1 Genetic Variation Within Population KEY CONCEPT A population shares a common gene pool. All the individuals of a species that live in the same area. 11.1 Genetic Variation Within Population Genetic variation in a population increases the chance that some individuals will survive. • Genetic variation leads to phenotypic variation. • Phenotypic variation is necessary for natural selection. • Genetic variation is stored in a population’s gene pool. – made up of all alleles in a population – allele combinations form when organisms have offspring 11.1 Genetic Variation Within Population • Allele frequencies measure genetic variation. – measures how common allele is in population – can be calculated for each allele in gene pool 11.1 Genetic Variation Within Population Genetic variation comes from several sources. • Mutation is a random change in the DNA of a gene. – can form new allele – can be passed on to offspring if in reproductive cells • Recombination forms new combinations of alleles. – usually occurs during meiosis when parents’ alleles arranged in new ways in gametes 11.1 Genetic Variation Within Population Genetic variation comes from several sources. • Hybridization is the crossing of two different species. – occurs when individuals can’t find mate of own species – topic of current scientific research 11.1 Genetic Variation Within Population Section Questions-Under your Power Notes 1. Why does genetic variation increase the chance that some individuals in a population will survive? 2. Describe two main sources of genetic variation. 3. In what way is a gene pool representative of a population? 4. If a certain trait’s allele frequency is 100 percent, describe the genetic variation for that trait in the population. 5. How does crossing over during meiosis provide a source of genetic variation? Draw a diagram to show this process.