1. Warm-Up (11/17)
On the piece of white paper from the back, answer the following question.
Name
Date
Period
Perform the punnet square below, and show the four genotypes and associated phenotypes produced in the F2 generation.

2. Definitions
Homozygous: for a given gene, an organism’s two alleles are identical
Heterozygous: for a given gene, an organism’s two alleles are different

3. Definitions Generations
In a genetic experiment, the original cross (mating) is the P generation.
The next is the F1, then F2, etc.

4. Gregor Mendel

5. Monohybrid Cross Ratio of tall to short: 3:1 tall:short, or
Law of Independent Assortment

6. Dihybrid Cross – 2 genes
“Law of Segregation”

7. Independent Practice
Discuss this question with your partner and write or represent it. I will call on three people to share their partners’ answers.
Draw a monohybrid cross between a heterozygous parent (Aa) and a homozygous recessive parent (aa). What are the phenotype distributions?
Draw a dihybrid cross between a AaBB parent and a AaBb parent. What are the phenotype distributions?

8. Closure
On the piece of white paper from the back, answer the following question:
Name
Date
Period
If two genes are on the same chromosome, explain why a dihybrid cross would not follow Mendel’s Law of Segregation.
Scale 1 – 10