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Comparing Mitosis and Meiosis
SWBAT: Compare and contrast mitosis and meiosis in terms of the number of chromosomes in the resulting cells, and its effect on genetic variation EQ: How does the sorting and recombination of genes result in genetic variation?
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Definition Meiosis Mitosis
Nuclear division to create gametes (sex cells) Nuclear division that divides somatic (body) cells
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Function/purpose Meiosis Mitosis Growth
Repair Development Produce gametes in sexually reproductive organisms
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Type of Reproduction Meiosis Mitosis Sexual reproduction – Asexual-
Two parents Offspring are genetically unique Asexual- One parent daughter cells are genetically identical
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Occurs in what type of Cell
Meiosis Mitosis Gametes (sex cells) Ovaries/testies Somatic cells (body cells)
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Genetically Identical?
Meiosis Mitosis genetically unique to parent genetically identical to parent
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Crossing-over? chromatids intertwine and swap pieces
Meiosis Mitosis occurs during prophase I causing genetic variation Crossing-over does not occur
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Pairing of Homologous Chromosomes
Meiosis Mitosis Chromosomes pair during Meiosis I (prophase I) Do not pair
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Rounds of division Two rounds of division One round of division
Meiosis Mitosis Two rounds of division One round of division
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# of daughter cells and # of chromosomes:
Meiosis Mitosis 4 haploid cells Reduces to 23 chromosomes 2 diploid cells 46 chromosomes
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Stages Involved Interphase
Meiosis Mitosis Interphase Meiosis I Prophase I Metaphase I Anaphase I Telophase I Meiosis II Prophase II Metaphase II Anaphase II Telophase II Interphase Prophase Metaphase Anaphase Telophase Each round of division ends with cytokinesis!
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Rounds of Cytokinesis …
Meiosis Mitosis Two rounds One round
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Process creates: 4 haploid gametes that are genetically unique
Meiosis Mitosis 4 haploid gametes that are genetically unique 2 diploid somatic cells that are genetically identical
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Table Talk Venn Diagram
Using the neon markers ONLY, complete the diagram on the table comparing meiosis and mitosis. Once you have been checked by Ms Beck, copy the correct answers into your sheet. Then, complete the back side of the worksheet. C: level 2 voice H: ask your teammates, then raise your hand A: complete venn diagram and activity M: remain at your table, walking around will result in a strike! P: complete venn diagram on table with team then your own sheet
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-Starts with one cell -Starts with interphase -DNA is replicated -Cytokinesis is involved Ends with 4 cells Produce haploid cells Homologous chromosomes separate first Makes gametes Ending human cells have 23 chromosomes End cells are genetically unique Makes somatic cells Ends with cells identical to original Produces diploid cells Ends with two cells Ending human cells have 46 chromosomes Sister chromatids separate first
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Comparing Mitosis and Meiosis: Pencil Talk
Work on the Meiosis worksheet in small groups, place pencils in the cup until all the questions have been discussed (13 min) then take pencil and write the answers C: level 2 voice H: Ask three of your classmates around you before me A: worksheet comparing Mitosis vs Meiosis and asexual vs sexual reproduction M: Remain seated P: Work with small group to discuss, then write. SUCCESS
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Meiosis vs. Mitosis
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