1. *List a minimum of 5 traits on each side of the chart*
Warm-Up
Create a t-chart
Label side 1 “mom” and side 2 “dad”
Predict which of your traits you inherited from each parent
Justify your predictions
*List a minimum of 5 traits on each side of the chart*

2. Introduction to Genetics
The “Game of Life”

3. Learning Objective
Students will be able to make predictions on genetic crosses using Punnett Squares with 80% accuracy.

4. Four Corners
For each question, self-assess and go to the corner that best fits your current level:
1: I need help!
2: I can do this with support
3: I am confident and can do it on my own
4: I’m an expert. I can teach this.

5. The History of Genetics
Gregor Mendel was the first to study genetics
He used true-breeding pea plants and cross-pollinated them to observe their traits

6. True-Breeding Plants

7. Mendel’s Experiments

8. Mendel’s Conclusions
Biological inheritance is determined by factors passed on from one generation to the next (Heredity)
Genes are the chemical factors that determine traits
Different forms of a gene are called alleles
Some alleles are dominant and some alleles are recessive

9. Dominant Alleles
An organism with a dominant allele will always show that trait
Example: Brown Eyes or Dimples

10. Recessive Alleles
An organism will only show the recessive allele when the dominant allele is NOT present
Example: Blue Eyes or Deafness

11. Genetics and Probability
Probability is the likelihood that a particular event will occur
Example: Choosing a playing card
The probability of choosing an ace from 4 cards is ¼
The probability never changes between each draw
Individual probabilities are multiplied by each other (¼ x ¼ = 1/16)
The principles of probability can be used to predict genetic outcomes

12. Punnett Squares
Punnett squares are diagrams used to predict and compare genetic variations that can result from a cross
Organisms with two identical alleles are homozygous
Example: BB or bb
Organisms with two different alleles are heterozygous
Example: Bb

13. Genotype and Phenotype
Genotype is the genetic make up
Example: BB or Bb or bb
Phenotype shows the physical characteristics for a trait (what you see)
Example: Brown eyes or Blue eyes

14. Check for Understanding
Use the colored note cards to answer each question
All of your note cards should be the same color
Verify that you have two of each letter

15. Learning Objective
Students will be able to make predictions on genetic crosses using Punnett Squares with 80% accuracy.

16. Sample Problem #1
Eye Color:
BB x bb

17. Sample Problem #2
Dimples: A woman is heterozygous for dimples (Dd). If she has offspring with a man who does not have dimples (dd), what are the possible genotypes and phenotypes and the percent chance of each?

18. Sample Problem #3
Earlobes: Attached earlobes are a recessive trait. If a man and woman are both heterozygous for floppy earlobes, can they have a child with attached earlobes? What are the possible genotypes and phenotypes and the percent chance of each?

19. With a Shoulder Partner. . .
Complete each sample problem
Partner A will complete the Punnett Square
Partner B will complete the genotypes and phenotypes and the percent chance of each
Reverse roles for each sample problem

20. Practice Problem #1
Height of Pea Plants: Tall pea plants are dominant to short pea plants. If a homozygous tall pea plant crosses with a short pea plant, can they produce short offspring? Show the genotypes and phenotypes and the percent chance of each.

21. Practice Problem #2
Freckles: Freckles are dominant to no freckles. If a heterozygous mother and a father with no freckles produce offspring, will their offspring have freckles? Show the genotypes and phenotypes and the percent chance of each.

22. Practice Problem #3
Pea Pod Color: Green pea pods are dominant to yellow pea pods. Can a green pea pod and a yellow pea pod create a yellow pea pod offspring? Create a Punnett Square to support your answer. Show the genotypes and phenotypes and the probability of each.

23. Practice Problem #4
Purple People Eaters: Two horns are dominant to one horn. A heterozygous purple people eater mates with a homozygous two-horn purple people eater. What are the possible genotypes and phenotypes and the probability of each?

24. Learning Objective
Students will be able to make predictions on genetic crosses using Punnett Squares with 80% accuracy.

25. Individual Practice
Complete the practice punnett square problems on the worksheet provided.
You may work individually or in pairs

26. Learning Objective
Students will be able to make predictions on genetic crosses using Punnett Squares with 80% accuracy. Assess with fist of 5

27. Exit Ticket Complete the exit ticket on the sticky notes
Aqua: What part of today’s lesson are you most confident about?
Pink: What areas of today’s lesson do you still need support with?
Turn it in as you leave the classroom