1. PROBABILITY OF INHERITANCE

2. Do Now
What are Gregor Mendel’s Laws of Genetics?

3. Big Idea
Based on Gregor Mendel’s laws of genetics and the work of Reginald Punnett (Punnett Square), we can determine the probability of inheriting dominant and recessive traits through generations based on an individual’s genotype.

4. Activity With a partner:
Share a list of your dominant/recessive traits
Share your family picture
Answer the following questions in your composition notebooks & share with your partner:
What traits does your partner have in common with their family member(s)?
According to your partner, what traits have been passed down from generation to generation in your partner’s family?

5. Probability of Inheriting a Trait
We can determine the probability of inheriting a dominant or recessive trait!
What do you think this means?

6. Vocabulary
Reginald Punnett
Punnett Square
Hybrid
Monohybrid Cross

7. WORD
DEFINITION
DRAWING
Reginald Punnett
Punnett Square
Hybrid
Monohybrid Cross

8. Reginald Punnett British Geneticist (1875-1967)
Formed a model to calculate the probability of inheriting a Mendelian trait
Model is called the “punnett square”

9. Punnett Square

11. Random Inheritance of Genes
What would the outcome be if you flip a coin 10 times?
How many “heads” did you get?
How many “tails”?
This is an example of random inheritance. The likelihood
of inheriting a gene from your parent is as random as
the flip of a coin.

12. Activity/Homework
Punnett Square Practice CLOSING QUESTION: -What is the probability that you will pass on a gene to your offspring? -What is the probability that they will express it? -What is the difference?