Includes Realistic Corn Ear Cutouts
- Observe Small Organisms And Correlate Between Size Of Organism, Temperature Of Environment, And Oxygen Consumption
- Measure Rate Of Oxygen Consumption Of Small Organisms
- Reusable Respiration Chambers
- Time Required: One 50 Minute Class Period
With this activity, students build an understanding of selective breeding for desired traits in crops. Using life-sized corn ear cardboard replicas, they investigate the outcomes of crosses of hybrid and dihybrid corn plants for two unlinked genetic trait corn kernel color and sweetness. They then use Punnett squares to predict the ratio of phenotypes that will be produced by different crosses and analyze the actual ratio of phenotypes of the second generation offspring. Background information on traditional selective breeding and modern genetic engineering approaches to improving crops is provided. Includes teacher's guide, student worksheets, and materials for 32 students.