1. Biology: Genetics Unit (Chp 7)
Pick up your journal
Take a white worksheet
Take a green vocab list (quiz next week)
Ask your neighbor…”What did you do over Thanksgiving break?”

2. Warm Up Nov 27 & 28
Why do you look similar to your parents and/or relatives?

3. Evolution Unit Test Results
If you scored below a 70% you may do corrections and retake the test.
Deadline for corrections and retake is Dec.7th.
Multiple Choice Average
1st Per – 80%
2nd Per – 81%
8th Per – 73%
Free Response Average
1st Per – 74%
2nd Per – 82%
8th Per – 77%

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

5. Learning Targets I can define terms used in our genetics unit.
I can predict how my traits were inherited.

6. 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

7. Class Genetics Study
Record Class Data—create a data table in your notes section.
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

8. Class Genetics Study
1. Which traits that we studied are dominant? Which trait has the most people with that characteristic?
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

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

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

11. Notes: 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.

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

13. Notes: 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

14. 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!

15. Notes: Two of Mendel’s Laws
Law of Inheritance
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

16. Notes: 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)

17. Notes: 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

18. Notes: 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

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

20. Back to Class Genetics
Answer the rest of the questions on the worksheet now.

21. Genotypes: EE or Ee or ee
2. What are the possible genotypes of people with free earlobes, with dominant = E and recessive = e?
Genotypes: EE or Ee or ee

22. 3. What is/are the possible phenotypes of someone with the genotype “ee”?
That person would have __________ earlobes because they have two recessive genes, there is not dominate allele to make the show the unattached earlobe trait.

23. 4. If you have free earlobes (unattached) phenotype, how could you find out your genotype?
You could list out all the possible genotypes: EE, Ee, and ee. If you have the dominant trait you have either EE or Ee. If one parent had attached earlobes you would know they have ee which means that you got one dominate from one parent and a recessive from another.

24. Yeast Lab Prep for next class.
Complete the background reading and the 4 pre-lab questions (a,b,c,d).
Be prepared to discuss these questions in class before we begin the investigation.