1. Inquiry 11/27 and 11/28 Prepare for new seats!
Pick up your lab book on the side counter (right of the whiteboard)

2. Due Dates Missing Unit 2 work due Friday
Retakes of the Unit 2 (Evolution) Test must be done by Thursday
M, W Power Hour
T, Th Power Hour or before/after school by appointment

3. Why does everyone look different from each other?
Unit 3: Genetics!
Why does everyone look different from each other?

4. Learning Targets
I can correctly write the genotype and phenotype of an organism.
I can use Punnett squares to predict offspring probabilities.

5. Class Genetics Study Record your results as we go through the trials:
Taster or non-taster
Roller or non-roller
Attached earlobes or free-hanging
Hitchhiker's thumb or not
L over R or R over L
Mid-digital hair or none
Right or left
Freckles or none

6. Class Genetics Study Record Class Data Taster or non-taster
Roller or non-roller
Attached earlobes or free-hanging
Hitchhiker's thumb or not
L over R or R over L
Mid-digital hair or none
Right or left
Freckles or none

7. Class Genetics Study
1. Which traits that we studied are dominant?

8. Intro. to Genetics
How do the genes you
inherit make you “you”?

9. History of Genetics Gregor Mendel 1822-1884 “Father of genetics”
Austrian monk who studied inheritance of physical traits in pea plants

10. Mendel’s Pea Plant Study
Pea plants reproduce sexually- with male and female gametes
Gametes = sperm (pollen) and eggs
Peas can self-pollinate and be true-breeding
True-breeding: short plants breed short plants and tall plants breed tall plants.

11. Mendel’s Pea Plant Study
Mendel studied these traits

12. Mendel’s Crosses
Mendel bred plants with different traits and studied the offspring.
original parents are the P generation.
offspring are the F1 (daughter/son) generation

13. Mendel’s Findings
When crossing parent plants (P) with different traits, all F1 plants looked the same!
When crossing F1 plants, three out of four offspring looked like the parents!

14. 2 of Mendel’s Laws Law of Inheritance Law of Dominance
Traits are controlled by pairs of genes- with one gene coming from each parent
These genes are called alleles
Law of Dominance
some alleles are dominant and other are recessive.
Dominant – physically expressed
Recessive – present but not expressed

15. Key Terms Gene Allele Sections of DNA within chromosomes
Are the units of heredity
Allele
Alternative genes for trait
Example: Height (Tall or Short); Eyes (Brown or Blue); Cheeks (Dimple or No Dimple); Hair Line (Peak or Straight)

16. Dominant vs. Recessive Each gene has two possible alleles
Dominant- always expressed
Recessive- always hidden by a dominant allele.
Example: Dimpled chin (cleft chin) is dominant
D= dimpled d= non-dimpled
Your two copies can
be DD, Dd, or dd

17. Dominant vs. Recessive Genotype= the alleles that you have for a trait
Phenotype= the physical expression of those alleles
A person with a dimpled chin can have the genotype DD or Dd
A person with a non-dimpled chin can only have the genotype dd

18. More Definitions Homozygous= two of same allele (DD or dd)
Heterozygous= two different alleles
(Dd- also called hybrid)

19. Back to Class Genetics
Answer the rest of the questions

20. Punnett Squares
Knowing genotypes of parents, we can predict the probability of offspring having dominant/recessive traits R RR r Rr
Results:
Genotypes:
50% RR; 50% Rr
Phenotypes:
100% round
Ex: Peas
Round seeds = R
Wrinkled seeds = r

21. Due next time
Nothing, unless you need to do a test retake or missing work