- Classroom activity
Time: 1 hour
Students compare the sequence of amino acids in a gene shared between humans and six other organisms and infer evolutionary relationships among the species.
- [History of life: Grades 9-12] Present-day species evolved from earlier species; the relatedness of organisms is the result of common ancestry. (LS4.A)
- [History of life: Grades 9-12] Biological evolution accounts for diversity over long periods of time. (LS4.A, LS4.D)
- [Evidence of evolution: Grades 9-12] Similarities among existing organisms provide evidence for evolution. (LS4.A)
- [Evidence of evolution: Grades 9-12] All life forms use the same basic DNA building blocks. (LS4.A)
- [Studying evolution: Grades 9-12] Scientists use the similarity of DNA nucleotide sequences to infer the relatedness of taxa. (LS4.A)
- [Studying evolution: Grades 9-12] Evolutionary trees (i.e. phylogenies or cladograms) portray hypotheses about evolutionary relationships.
- Disciplinary Core Idea LS4.A: Evidence of Common Ancestry and Diversity
- Disciplinary Core Idea LS4.D: Biodiversity and Humans
The video and worksheet are each worthwhile, but could easily be used separately.