10-3 & 10-4: Meiosis Reduces the # of Chromosomes sets from Diploid to Haploid, and Genetic Variation Produced in Sexual Life Cycles Contributes to Evolution

10-3 & 10-4: Meiosis Reduces the # of Chromosomes sets from Diploid to Haploid, and Genetic Variation Produced in Sexual Life Cycles Contributes to Evolution

Key Terms: Meiosis I, Meiosis II, Crossing Over, Chiasmata, Synapsis, Recombinant Chromosomes, 

BELLWORK: Watch and take your own notes on the Meiosis Amoeba Sisters video.

IN CLASS READING of Concept 10.3 and 10.4: Pages 205-212 in your text.

From page 205:

1. Explain one way that Meiosis is like Mitosis.
2. State the number of cell divisions that take place in Meiosis.
3. State the # of daughter cells produced by Meiosis.
4. State the number of chromosomes present in a cell produced by Meiosis (in relation to the parent cell).

From page 206:
5. State the phase of Meiosis I in which crossing over occurs.
6. Explain the result, genetically speaking, of crossing over.
7. Decide whether a cell goes from diploid to haploid during Meiosis I or Meiosis II.
8. Explain what chiasmata are.

From page 208:
9. Paraphrase the summary of crossing over and synapsis seen in figure 10.9. Include simple drawings, too.
10. List and summarize 3 events that are unique to Meiosis.

From page 209:
11. Create a table or chart that compares and contrasts Mitosis with Meiosis (see lower part of fig. 10.10)

From page 211:
12. Summarize how crossing over increases genetic diversity.
13. Summarize how the independent assortment of chromosomes increases genetic diversity.

From page 212:
14. Summarize how random fertilization increases genetic diversity.
15. State the original source of variation among alleles.
16. Explain the connection between sexual reproduction, genetic variation, and natural selection.