Students randomly select jelly beans (or other candy) that represent genes for …
Students randomly select jelly beans (or other candy) that represent genes for several human traits such as tongue-rolling ability and eye color. Then, working in pairs (preferably of mixed gender), students randomly choose new pairs of jelly beans from those corresponding to their own genotypes. The new pairs are placed on toothpicks to represent the chromosomes of the couple's offspring. Finally, students compare genotypes and phenotypes of parents and offspring for all the "couples" in the class. In particular, they look to see if there are cases where parents and offspring share the exact same genotype and/or phenotype, and consider how the results would differ if they repeated the simulation using more than four traits.
Biology students often struggle to understand how it can be that the …
Biology students often struggle to understand how it can be that the same two parents will produce genetically different offspring. This lab exercise is a very visual way to demonstrate the "making of a monster" one gene at a time. The resources include a full sheet of vocabulary and instructions, plus a data table to record the crosses. For advanced students, you can take the activity further with a sheet of follow up questions.
In a class discussion format, the teacher presents background information about basic …
In a class discussion format, the teacher presents background information about basic human genetics. The number of chromosomes in both body cells and egg and sperm cells is covered, as well as the concept of dominant and recessive alleles. Students determine whether or not they possess the dominant allele for the tongue-rolling gene as an example.
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