Genetics part 3
14
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? • Wrinkled? If two heterozygous round pea plants are crossed, what percent of the offspring will be: • Round? • Wrinkled? If a heterozygous round pea plant is crossed with a homozygous wrinkled pea plant, what percent of the offspring will be: • Round? • Wrinkled? Solve these in your noteboo k.
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Transcript of Genetics part 3
Solving Punnett SquaresIf a round pea plant (AA) is crossed with a wrinkled pea plant (aa), what percent of the offspring will be:
• Round?
• Wrinkled?
If two heterozygous round pea plants are crossed, what percent of the offspring will be:
• Round?
• Wrinkled?
If a heterozygous round pea plant is crossed with a homozygous wrinkled pea plant, what percent of the offspring will be:
• Round?
• Wrinkled?
Solve these in your notebook.
Practice
• Sponge Bob Genetics
• Glue in your notebook
Solving Punnett Squares
Parents
Offspring
Predicting phenotype gets more complicated when you look at more than one trait at a time.
Solving Punnett Squares
Depending on how chromosomes independently assort determines genotype, and thus phenotype, of the resulting progeny (offspring)
Parents
Offspring
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?
Practice
• Dihybrid Crosses handout (bunny rabbits). Glue in your notebook.
• Complete Dominance:
• Codominance
• Incomplete Dominance
• Sex-Linked
• Polygenic Traits
Phenotypic Expression Varies
Write this list, then we will describe each one in detail.
• Complete Dominance: Homozygous dominant genotype dominant phenotype
Heterozygous genotype dominant phenotype
Homozygous recessive genotype recessive phenotype
Phenotypic Expression Varies
Phenotypic Expression Varies
• Codominance Homozygous genotype one phenotype
Heterozygous genotype both phenotypes
Phenotypic Expression Varies
• Codominance Homozygous genotype one phenotype
Heterozygous genotype both phenotypes
Phenotypic Expression Varies
R1 R1
R2 R1R2 R1R2
R2 R1R2 R1R2
R R
W RW RW
W RW RW
• Codominance Homozygous genotype one phenotype
Heterozygous genotype both phenotypes
Practice
• Intro to blood types (first 3 minutes good)
• Complete blood typing handout and glue in your notebook.
• Incomplete Dominance Homozygous genotype one phenotype
Heterozygous genotype new phenotype
Phenotypic Expression Varies
• Incomplete Dominance Homozygous genotype one phenotype
Heterozygous genotype new phenotype
Phenotypic Expression Varies
