what are we learning today? 1.what are the phases of meiosis and what happens during each phase?...
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What are we learning today?
1.What are the phases of meiosis and what happens during each phase?
2.What is the significance of meiosis to sexual reproduction?
![Page 2: What are we learning today? 1.What are the phases of meiosis and what happens during each phase? 2.What is the significance of meiosis to sexual reproduction?](https://reader036.vdocument.in/reader036/viewer/2022070402/56649f275503460f94c3f085/html5/thumbnails/2.jpg)
What are we learning today?
1.How are mitosis and meiosis similar?
2.How are mitosis and meiosis different?
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Meiosis
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Cell basics• Somatic cells :
have two sets of chromosomes.
• One from each parent.
• Includes all cells in your body except gametes
• Somatic cells are diploid.
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Cell basics• Diploid : contains
two sets of chromosomes
• The two chromosomes in each pair are called homologous.
• Humans have 23 pair of homologous chromosomes.
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Cell basics
• Autosomes : all chromosomes in the cell except the sex chromosomes X & Y
• Humans have 22 pair of autosomes and 1 pair of sex chromosomes.
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Cell basics
• For reproduction to occur, the chromosome number must be reduced by ½.
• Remember, in a somatic cell, one chromosome came from each parent
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Meiosis• Meiosis : cell
division which results in the production of gametes with half the number of chromosomes
• When fertilization occurs, the zygote will contain the full set of homologous chromosomes
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Meiosis
• The cells produced from meiosis are haploid• Haploid : cells with one copy of each
chromosome.• Gametes are haploid.
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Meiosis
• The phases of meiosis are similar to mitosis
• Meiosis consists of 2 divisions of the cell.
• The result is four daughter cells.
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Stages of Meiosis
• The stages of meiosis are named prophase, metaphase, anaphase, telophase
• The 2 cell divisions are distinguished by “I” or “II”
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Result of Meiosis
• Four haploid cells called gametes
• Four daughter cells not identical to the parent cell.
• Gametes are necessary for sexual reproduction
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What are we learning today?
1.What are the phases of meiosis and what happens during each phase?
2.What is the significance of meiosis to sexual reproduction?
![Page 15: What are we learning today? 1.What are the phases of meiosis and what happens during each phase? 2.What is the significance of meiosis to sexual reproduction?](https://reader036.vdocument.in/reader036/viewer/2022070402/56649f275503460f94c3f085/html5/thumbnails/15.jpg)
What are we learning today?
1.How are mitosis and meiosis similar?
2.How are mitosis and meiosis different?