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Natural Selection of Strawfish AP Biology 2007-2008 Phenotypes & Genotypes Phenotypes are controlled by genotype AP Biology Phenotype is Selected Natural selection acts on phenotype AP Biology Gene Pool is Affected Natural selection changes allele frequency AP Biology Behind the scenes FISH ALLELES B G Y Tot Gen 1 3 3 3 9 Gen 2 3 3 1 7 What happened to the frequency of the yellow allele? AP Biology Will yellow fish be born as often? Will the yellow allele disappear? B Y Tot Gen 1 9 9 18 Gen 2 9 5 14 ALLELE Frequency B Y Tot Gen 1 .5 .5 1.0 Gen 2 .6 .4 1.0 Any QUESTIONS?? Is a gene a fish’s way of making more fish? or… Is a fish a gene’s way of making more genes? AP Biology 2007-2008