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A population shares a common gene pool.
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Genetic Variation- variety of genes.
increases the chance that some individuals will survive. leads to phenotypic variation. Gene pool- all alleles in a population * Phenotypic variation is necessary for natural selection *
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Allele frequencies measure genetic variation.
measures how common an allele is in a population can be calculated for each allele in gene pool
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How do populations become varied?
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Mutation is a random change in the DNA of a gene.
can form a new allele can be passed on to offspring if in reproductive cells
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Recombination forms new combinations of alleles.
usually occurs during meiosis parents’ alleles arranged in new ways in gametes
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Hybridization is the crossing of two different species.
occurs when individuals can’t find mate of own species
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