1. Take out your white and green genetics worksheets for check off.
Biology 11/ /30
Prepare for a warm-up!
Take out your white and green genetics worksheets for check off.

2. Warm-Up 11/29 and 11/30
In humans, achondroplasia (dwarfism) is dominant.
What are the three possible genotypes someone can have? (you choose the letter)
What are the possible genotype(s) of someone with dwarfism?

3. Learning Targets
I can use a Punnett Square to predict offspring probabilities
I can carry out an experiment to explore dominant and recessive genes in yeast.

4. Punnett Square Practice
Check your work!

5. Yeast Lab
When we mate different yeast parents, which traits show up and why?

6. Background Knowledge
Read pages and answer the questions on the handout.

7. Yeast Lab Background Information
Yeast are Fungi.
Yeast are single celled and eukaryotic.
Yeast have mating types instead of sexes.
Mating types are “a” and “alpha”.
A deliberate mating is called a CROSS.
There are many strains of yeast.
Strain 2 = pinkish red colored (both the a2 and alpha2)
Strain 3 = cream colored (both a3 and alpha3

8. Yeast Lab Hypothesis and Data
Draw a mating grid in your hypothesis circle. Predict, in color, what will happen. Explain why.
First set of parents
Alpha2
(red)
Alpha3
(cream) a2 a3
Second set of parents

9. Materials Sharpie Petri dish Waste cup Toothpicks
Class yeast- 4 plates (alpha 2, a2, alpha3, a3)

10. Done? Move on to the Punnett Square practice
Required: page one
Optional: watch dihybrid cross video and do page 2.