Chromosomal Genetics

The instructor in a biology video defines and shows examples of incomplete dominance, codominance, epistasis, and multiple alleles. Viewers then explore Thomas Hunt Morgan and his crosses showing the discovery of gene linkage via fruit fly eye color and wing type, which doesn't follow Mendelian genetics. The video also discusses sex-linked traits. 

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CCSS: Adaptable
NGSS: Adaptable
Instructional Ideas

  • Pause video so learners can record the four definitions of the terms found in the beginning
  • Explain gene linkage, then pause the video to ask questions and discuss the concepts as a class
Classroom Considerations

  • Teachers need a computer, Internet access, and a way to project the video
  • Video assumes scholars understand homozygous and heterozygous genotypes
  • Expects learners understand probability
  • The fourth video in a series of 31

  • Great, simple explanation of gene linkage with good visuals
  • Examples used to show multiple genes (hitchhikers thumb, height of kids) are engaging for high-school learners

  • Some bits of video are repetitive of the first video in the series
Common Core