Date: February 9, 2016 Aim #53: How does meiosis and fertilization increase variation among offspring? HW: Another Meiosis Worksheet due tomorrow  Meiosis.

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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 92

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) 93

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

What do these pictures show?

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

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

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

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

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

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.

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

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

Trillions of possible combinations Variation

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

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