Genetics part 3
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The document provides instructions for solving Punnett squares to predict percentages of offspring phenotypes for different genetic crosses involving pea plants. It includes examples of crosses between round and wrinkled pea plants, and instructions for students to practice solving Punnett squares for dihybrid crosses and crosses involving multiple traits. The document also introduces different patterns of phenotypic expression like complete dominance, codominance, and incomplete dominance.
Genetics part 3
- 1. Solving Punnett Squares If a round pea plant (AA) is crossed with a wrinkled pea plant (aa), what percent of the offspring will be: • Round? Solve these • Wrinkled? If two heterozygous round pea in your plants are crossed, what percent of the offspring will be: • Round? notebook. • Wrinkled? If a heterozygous round pea plant is crossed with a homozygous wrinkled pea plant, what percent of the offspring will be: • Round? • Wrinkled?
- 2. Practice • Sponge Bob Genetics • Glue in your notebook
- 3. Solving Punnett Squares Predicting phenotype gets more complicated when you look at more than one trait at a time. Parents Offspring
- 4. Solving Punnett Squares Parents Depending on how chromosomes independently assort determines genotype, and thus phenotype, of the Offspring resulting progeny (offspring)
- 5. Solving Punnett Squares: page ___ of notebook If a round, yellow pea plant (AABB) is crossed with a wrinkled, green pea plant (aabb), what percent of the offspring will be: • Round and yellow? • Round and green? • Wrinkled and yellow? • Wrinkled and green?
- 6. Practice • Dihybrid Crosses handout (bunny rabbits). Glue in your notebook.
- 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. Phenotypic Expression Varies • Complete Dominance: Homozygous dominant genotype dominant phenotype Heterozygous genotype dominant phenotype Homozygous recessive genotype recessive phenotype
- 9. Phenotypic Expression Varies • Codominance Homozygous genotype one phenotype Heterozygous genotype both phenotypes
- 10. Phenotypic Expression Varies • Codominance Homozygous genotype one phenotype Heterozygous genotype both phenotypes
- 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. Practice • Intro to blood types (first 3 minutes good) • Complete blood typing handout and glue in your notebook.
- 13. Phenotypic Expression Varies • Incomplete Dominance Homozygous genotype one phenotype Heterozygous genotype new phenotype
- 14. Phenotypic Expression Varies • Incomplete Dominance Homozygous genotype one phenotype Heterozygous genotype new phenotype