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#49 Warm UP

#49 Warm UP. Why do you think our cells need to be able to replicate themselves?. Change the # on your sheet to 49. Activity – Cell Division Observations. Part 1 - Diagrams Look at the two diagrams. One is mitosis, and one is meiosis. Write captions in the boxes.

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#49 Warm UP

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  1. #49 Warm UP Why do you think our cells need to be able to replicate themselves? Change the # on your sheet to 49

  2. Activity – Cell Division Observations • Part 1 - Diagrams • Look at the two diagrams. One is mitosis, and one is meiosis. • Write captions in the boxes. • Part 2 – Animated Interactive • Get a laptop for you and your partner and go the Cell Division Link at the school website. • Answer the questions on the notes sheet. • Part 3 – Comparing • 1. Try to fill out the table in the notes. Extension: Work on the Regents Practice HOMEWORK. Work on VOCAB

  3. Mitosis vs. Meiosis

  4. Animation Questions In step 3 of Meiosis, what do you see happening to the paired-up chromosomes? At the end of all of the steps, how do the daughter cells (cells at the end of the processes) compare to each other? Mitosis: Meiosis: 3. How do they compare to the parent cells? Mitosis: Meiosis:

  5. How does meiosis lead to genetic variation? • Crossing-over and recombination occur during meiosis: parts of the chromosomes overlap and exchange • Every gamete produced will have a new and different genetic combination of the parent’s genes! Meiosis only happens to cells in the ovariesof females and in the testesof males

  6. Regents Practice What would most likely result if mitosis was not accompanied by cytoplasmic division? 1) two cells, each with one nucleus 2) two cells, each without a nucleus 3) one cell with two identical nuclei 4) one cell without a nucleus

  7. REGENTS PRACTICE

  8. REGENTS PRACTICE Reflection How does meiosis contribute to the variation present among the offspring of sexually reproducing organisms? HOMEWORK • Regents Practice – Mitosis & Meiosis • Study Island #2 • VOCAB

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