Genetics part 3

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Genetics part 3

  1. 1. Solving Punnett SquaresIf a round pea plant (AA) is crossedwith a wrinkled pea plant (aa), whatpercent of the offspring will be: • Round? Solve these • Wrinkled?If two heterozygous round pea in yourplants are crossed, what percent ofthe offspring will be: • Round? notebook. • Wrinkled?If a heterozygous round pea plant is crossedwith a homozygous wrinkled pea plant, whatpercent of the offspring will be: • Round? • Wrinkled?
  2. 2. Practice• Sponge Bob Genetics• Glue in your notebook
  3. 3. Solving Punnett SquaresPredicting phenotype getsmore complicated whenyou look at more than onetrait at a time. Parents Offspring
  4. 4. Solving Punnett Squares ParentsDepending on howchromosomesindependentlyassort determinesgenotype, and thusphenotype, of the Offspringresulting progeny(offspring)
  5. 5. Solving Punnett Squares: page ___ of notebookIf a round, yellow pea plant(AABB) is crossed with awrinkled, green pea plant(aabb), what percent of theoffspring will be: • Round and yellow? • Round and green? • Wrinkled and yellow? • Wrinkled and green?
  6. 6. Practice• Dihybrid Crosses handout (bunny rabbits). Glue in your notebook.
  7. 7. Phenotypic Expression Varies• Complete Dominance:• Codominance Write this list,• Incomplete Dominance• Sex-Linked then we will• Polygenic Traits describe each one in detail.
  8. 8. Phenotypic Expression Varies• Complete Dominance:  Homozygous dominant genotype  dominant phenotype  Heterozygous genotype  dominant phenotype  Homozygous recessive genotype  recessive phenotype
  9. 9. Phenotypic Expression Varies• Codominance  Homozygous genotype  one phenotype  Heterozygous genotype  both phenotypes
  10. 10. Phenotypic Expression Varies• Codominance  Homozygous genotype  one phenotype  Heterozygous genotype  both phenotypes
  11. 11. Phenotypic Expression Varies• Codominance  Homozygous genotype  one phenotype  Heterozygous genotype  both phenotypes R R W RW RW W RW RW R1 R1 R2 R1R2 R1R2 R2 R1R2 R1R2
  12. 12. Practice• Intro to blood types (first 3 minutes good)• Complete blood typing handout and glue in your notebook.
  13. 13. Phenotypic Expression Varies• Incomplete Dominance  Homozygous genotype  one phenotype  Heterozygous genotype  new phenotype
  14. 14. Phenotypic Expression Varies• Incomplete Dominance  Homozygous genotype  one phenotype  Heterozygous genotype  new phenotype

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