How are traits passed from one generation to the next to create unique individuals?
Using the information learned throughout the genetics unit, students will take a personal inventory of traits determined by simple inheritance rules. Students will then choose one of those traits to take an inventory of the expression of the phenotype of the trait in their extended family. Using that inventory, the students will create a pedigree chart tracing the inheritance of the trait and determining as many genotypes as possible.
Skills Learned, Expanded and Solidified:
- Write a clear, concise analysis that uses proper scientific concepts and follows writing rubric
- Use mathematical models to predict random outcomes.
- Use deductive and inductive reasoning to determine genotypes of various phenotypes.
- Express the scientific concept of a pedigree chart in a logical and creative manner.
- MS-LS1-5 Construct a scientific explanation based on evidence for how environmental and genetic factors influence the growth of organisms.
- MS-LS3-2 Develop and use a model to describe how asexual reproduction results in offspring with identical genetic information and sexual reproduction results in offspring with genetic variation. Compare and contrast advantages and disadvantages of asexual and sexual reproduction.
- MS-LS3-3 Communicate through writing and in diagrams that chromosomes contain many distinct genes, and that each chromosome pair contains two alleles that can be the same or different from each other. Illustrate that each gene holds the instructions for the production of specific proteins, which in turn affects the traits of an individual.
- MS-LS3-4 Develop and use a model to show that in sexually reproducing organisms individuals have two of each chromosome, and hence two alleles of each gene, one acquired (randomly) from each parent.
- MS-LS4-4 Understand the concept of a ratio and use ratio language to describe a ratio relationship between two quantities. Recognize and represent proportional relationships between quantities.
- Personal inventory of traits
- List of family members and an inventory of the phenotypes of the studied trait
- Draft of family tree in preparation to create pedigree chart
- Written analysis of the genotypes of family members
- Display board of completed family pedigree
- Written analysis of genotypes of family members that includes a logical explanation of how the student determined, or did not determine, the genotypes of each family member.
- Creation and display of a completed pedigree chart with appropriate symbols, genotypes, definitions and illustrations.
- Oral presentation of family pedigree.