1. 1/23 Daily Catalyst Pg. 72
1. Why is sexual reproduction and mutations the greatest source of genetic variation pertaining to evolution?
2. During mitosis, a cell has 6n chromosomes. At the end of mitosis, how many chromosomes should the daughter cells have? Why? At the end of meiosis?
3. List the two stages we see tetrads in meiosis.

2. 1/23 Daily Catalyst Pg. 72
1. Why is sexual reproduction and mutations the greatest source of genetic variation pertaining to evolution?
Sexual reproduction includes cross over, independent assortment of chromosomes and random fertilization so along with mutations, which are random changes in DNA, all of these mechanisms lead to changes in DNA which is EVOLUTION!
2. During mitosis, a cell has 6n chromosomes. At the end of mitosis, how many chromosomes should the daughter cells have? Why? At the end of meiosis?
6n because mitosis is a CONSERVATIVE process
3n, because meiosis is a REDUCTIVE process
3. List the two stages we see tetrads in meiosis.
Prophase I and metaphase I

3. 1/23 Class Business Pg. 72
Please track your data on the poster AND in your notebook
Quiz #17 this Monday
Genetics test February 2nd or 3rd
Study guide due test day
Notebook check test day
Tutoring after/before school, during lunch and 4th period
Study paper due Friday, 1/30

4. 1/23 Agenda Pg. 72 Daily Catalyst Class Business Essay HW review
Mendel Genetics

5. 1/23 Objective
We will be able to apply mathematical routines to determine Mendelian patterns of inheritance provided by data sets.

6. Take 30 seconds to answer this question and share with your partner.
If you a mate a tall pea plant with a short pea plant, what height will the offspring (children) be? Be ready to explain your answer.

7. Today’s Question…
How do you know whether you’ll end up looking like your Mom’s chromosomes or your Dad’s?

8. A famous scientist named Gregor Mendel had that same question!
~1857, Mendel began breeding garden peas.
He studied pea plants to determine that there are rules to trait inheritance.
Where was Darwin in this?

9. Overview
The genetic material of two parents is not blended in offspring, but is passed on to future generations in heritable units (genes).

10. Mendel’s quantitative approach
Parent
Key Point #1:
Hybrid
Offspring

11. The Law Of Segregation Key Point #2: 1. Alleles
Different versions of a trait
Mendel found that in the F1 generation, a blended trait was not seen. Only one of the original parental traits was seen. In the F2 generation, the missing parental trait reappeared in the ratio of 3:1. The dominant offspring is 3 and the recessive trait is 1.

12. The Law Of Segregation Key Point #3:
2. An organism has two alleles for each trait
One from each parent
AA, Aa, aa
Refer to the terminology like homozygous, heterozygous, dominant and recessive.

13. The Law Of Segregation Key Point #4: Two alleles come together
Dominant alleles: determine the appearance
Recessive alleles: no observable effect

14. The Law Of Segregation “Segregate”
Key Point #5: The Law of Segregation
Allele pairs separate during formation of gametes
Random fertilization results in variation

15. Workbook
Directions: Complete the genetics vocabulary worksheet in your workbook.
Time: 10 minutes
Noise: 1 (with partner)

16. The Law Of Segregation
Explain the following statement: Alternative versions of genes account for variations in inherited characters.

17. The law of segregation

18. If we know phenotype, do we know genotype?
Why or why not?
Turn and talk with your neighbor for 20 seconds

19. The Law of Independent Assortment
Key Point #6: Dihybrid Cross
To determine if two characteristics are transmitted independently or separately
9:3:3:1
9- all dominant traits (AA, BB)
3- dominant and recessive traits (Aa, bb)
3- dominate and recessive traits (aa, BB)
1- all recessive traits (aa, bb)

20. The Law of Independent Assortment

21. The Law of Independent Assortment
Key Point #7: The Law of Independent Assortment
Every pair of allele for each trait segregate independently in the formation of gametes

22. The Law of Independent Assortment
A true-breeding tall. Purple-flowered pea plant (TTPP) is crossed with a true –breeding dwarf, white-flowered plant (ttpp).
A. What is the phenotype of the f1 generation?
B. What is the genotype of the F1 generation?
C. What four types of gametes are formed by F1 plants?
D. Fill in the following Punnett Square to show the offspring of the F2 generation. Shade each phenotype a different color so you can see the ratio of offspring.
E. List the phenotypes and ratios found in the F2 generation.
F. What is the ratio of tall to dwarf plants?
Of purple to white flowered plants? ( note that alleles for each trait segregate as in a monohybrid cross)

23. A. tall purple plants
B. TtPp
C. TP, Tp, tP, tp D.
E. 9 tall purple: 3 tall white:3 dwarf purple: 1 dwarf white
F. 12:4 or 3:1 tall to dwarf; 12:4 or 3:1 purple to white

24. The Law of Probability Key Point #8:
What is the probability of rolling a three on a dice?
One out of six
What is the probability of rolling a 3, 5, and 6 on a dice?
Three out of six

25. https://www. youtube. com/embed/NWqgZUnJdAY