1. Date: February 9, 2016
Aim #53: How does meiosis and fertilization increase variation among offspring?
HW:
Another Meiosis Worksheet due tomorrow 
Meiosis Flip Book due by Friday!
Quiz Mitosis/Meiosis (Aim #’s 46-52) Thursday (p.1 & p.7) and Friday (p.5)
Do Now: Warm-Up Notebook
Date Title of Activity Page #
2/9 Comparing Mitosis and Meiosis

2. Date: February 10, 2016
Aim #53: How does meiosis and fertilization increase variation among offspring?
HW:
And another Meiosis Worksheet due tomorrow 
Meiosis Flip Book due by Friday!
Quiz Mitosis/Meiosis (Aim #’s 46-52) Thursday (p.1 & p.7) and Friday (p.5)
Unit 6 Test Thursday 2/25 & Friday 2/26
Do Now: Warm-Up Notebook
Date Title of Activity Page #
2/10 Interphase (Review)

3. Aim #53: How does meiosis and fertilization increase variation among offspring?

4. What do these pictures show?

5. Measure your partner’s ear length
Are every bodies ear length the same?
Why not?
Genetic variation

6. 1) Genetic Variation Meiosis: crossing over independent assortment
Variation between organisms due to:
Meiosis:
crossing over
independent assortment
Fertilization

7. 2) Meiosis Review DNA replicates Prophase I: synapsis & crossing over
1st Division – 2 cells
2nd Division – 4 haploid cells

8. 3) Crossing Over
During meiosis I (prophase I) homologous pairs synapse (line up) and an exchange of genes occurs

9. 4) Genetic Recombination
During Crossing Over, genes change their location on chromosomes. This change increases genetic variation and leads to offspring with different appearances.

10. 5) Independent Assortment
During meiosis, the homologous pairs line up and separate randomly (matter of chance).
In other words, the chromosomes separate randomly into gametes.

11. 6) What is the result of independent assortment?
Different combinations of genes in gametes

12. 7) Fertilization
During fertilization a mother’s genes (egg) and a father’s genes (sperm) combine. This combination of genes results in Genetic Recombination.

13. Trillions of possible combinations
Variation

14. Label the diagram below:
n=2
2n=4
n=2
Sperm
Ovum
Zygote

15. Variation What type of cell division leads to variation? How?
How does fertilization lead to genetic variation?