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Beyond Mendel: Incomplete Dominance, Codominance, Dihybrid Crosses

Explore the complexities of genetics beyond Mendelian principles, including incomplete dominance, codominance, and dihybrid crosses.

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Beyond Mendel: Incomplete Dominance, Codominance, Dihybrid Crosses

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  1. Chapter 8 Quiz 1 Chapter 8 – Beyond Mendel Incomplete dominance Codominance Dihybrid crosses “For every complex problem, there is a solution that is simple, neat, and wrong.” H.L. Mencken To continue learning about Mendelian genetics and learn about some of the aberrations to Mendelian genetics Title: Biology 1/31/07 Class Topics Objectives: Sunday, October 20, 20195:40 PM

  2. Class Assignments What By When • Chapter 8 Quiz 1 1/31/07 • Genetics Problems 2/2/07 • Read 170-178 2/2/07 • Chapter 8 Quiz 2 2/6/07 • Due this class period • Due next class period • Due in the future

  3. Grade Sheet 2A – p. 157 (5 pts.)

  4. Postquiz Activities • Hand in quiz • Read 170-178 • Work on Genetics Problems W.S. • Correct homework

  5. Incomplete dominance • In some organisms neither allele is dominant • Blending of traits • Snapdragons - red, white, and pink • P ___ x ___ • F1 • Pheno • Geno • F2 • Pheno • Geno

  6. From : http://www.synapses.co.uk/genetics/codom.html

  7. Codominance • Both traits are dominant and shown equally • Roan cattle - both red hairs and white hairs • 3 phenotypes - red, white, roan • Erminette chickens - both black and white feathers • 3 phenotypes - black, white, and black and white

  8. http://tidepool.st.usm.edu/crswr/codominance.html

  9. Dihybrid cross • Crossing two traits • Green and Tall plant (GgTT) x with yellow and Tall plant (ggTt) • FOIL - GgTT • FOIL - ggTt • 16 box punnett square

  10. Dihybrid Cross • GgTT x ggTt

  11. Results • F1 - Pheno • Green/Tall • Green/short • yellow/Tall • yellow/short • What if there were 160 of these seeds planted? How many of each type would there be?

  12. Video Reviews • “Investigating Mendel’s law of segregation” • “Using terms of Modern Genetics to explain Mendel’s work”

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