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Do you see variation among offspring? Could these genes change over time? Things to think about • Could particular phenotypes be beneficial? • Can the genes of a population change over time? • Would the inheritance pattern influence how quickly a gene pool can change? Purpose: To determine if the environment affects genes in a population and if alleles in a population can change over time In Fish Color is a multiple allele trait with recessive dominant and incomplete dominance inheritance patterns The green allele (G) is dominant to all other color alleles The red allele (R) is recessive to green(G) and incomplete dominant to yellow The yellow allele (Y) is recessive to green Incomplete dominant to red Phenotype Green: Red Orange Yellow Possible Genotypes GG,GY,GR RR RY YY Check your neighbor… • What color would the fish be if it had the following alleles? • RY • RG • YG • YY Procedure Follow the procedure on handout to determine the phenotype and number of each allele in four generations. Note:READ THE DIRECTIONS VERY CAREFULLY AS “EVENTS” WILL OCCUR Note: Toothpicks represent an allele, not a fish Data: Phenotype and allele numbers in Four Generation of Fish P1 F1 Generation Generation Red Fish NA Green Fish NA Yellow Fish NA Orange Fish NA Red Alleles Green Alleles Yellow Alleles F2 Generation F3 F4 F4 Generation Generation Generatio n Survivors