Do you see variation among offspring?

Do you see variation among offspring?

Do you see variation among offspring of the sesame street characters?

Things to think about • Are there various genes in the sesame street offspring? • Could particular phenotypes be beneficial? • Can the genes of a population change?

Purpose: To determine if the environment affects genes in a population?

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 gene (Y) is recessive to green Incomplete dominant to red

Phenotype Possible Genotypes Green: GG,GY,GR Red RR Orange RY Yellow 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

Datq:

Do you see variation among offspring?