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# Notes dihybrid crosses

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### Notes dihybrid crosses

1. 1. Bell Work• Study for the quiz! Look over your punnett square worksheets
2. 2. Notes: Dihybrid Crosses (pg 11)
3. 3. Notes: Dihybrid Crosses (pg 11)• Dihybrid cross = A cross involving 2 different traits
4. 4. Notes: Dihybrid Crosses (pg 11)• Dihybrid cross = A cross involving 2 different traits• Step 1: Figure out gametes (use FOIL)
5. 5. Notes: Dihybrid Crosses (pg 11)• Dihybrid cross = A cross involving 2 different traits• Step 1: Figure out gametes (use FOIL) Example 1: Parent genotype = AaBb Gametes = AB, Ab, aB, ab
6. 6. Notes: Dihybrid Crosses (pg 11)• Dihybrid cross = A cross involving 2 different traits• Step 1: Figure out gametes (use FOIL) Example 1: Parent genotype = AaBb Gametes = AB, Ab, aB, ab Example 2: Parent genotype = RrGG
7. 7. Notes: Dihybrid Crosses (pg 11)• Dihybrid cross = A cross involving 2 different traits• Step 1: Figure out gametes (use FOIL) Example 1: Parent genotype = AaBb Gametes = AB, Ab, aB, ab Example 2: Parent genotype = RrGG Gametes = RG, rG
8. 8. • Step 2: Punnett square: Write one set of gametes across the top and one down the side. Can have up to 16 boxes
9. 9. Handout: Paste in on pg 11Fill in the boxes of the Punnett square then color code as follows:• Yellow Round: Color whole box yellow• Green Round: Color whole box green• Yellow wrinkled: Color half box yellow• Green wrinkled: Color half box green
10. 10. Practice Problem (pg 10)• A female pea plant that is pure yellow and heterozygous round is crossed with a male plant that is green and heterozygous round1. List the genotypes of the parents2. List the gametes each parent could make3. Draw the Punnett square (Hint: it will have 4 boxes)4. Give the phenotype ratios