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Meiosis

Reproductive Cells. Called Gametes Males

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Meiosis

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    1. Meiosis If all of your cells contain 2 copies of each chromosome, how is it that you only give 1 set to your offspring?

    2. Reproductive Cells Called Gametes Males – Sperm Females– Egg

    3. Meiosis Is the process all cells go through to divide. Gametes (reproductive cells) undergo a process entitled meiosis.

    4. Meioses Meiosis reduces the number of chromosomes in new cells to half the number in the original cell. Humans are diploid (2n)—meiosis produces haploid (1n) reproductive cells. Called Gametes

    5. Gametes either sperm or egg contain 23 chromosomes are haploid cells 1 set of chromosomes (1n)

    6. Making Babies (Zygotes) Fusion of gametes produces a zygote. Sperm and Egg come together Zygote - fertilized egg contains 46 chromosomes are diploid cells that contain 2 sets of chromosomes or 2n—one from the sperm and one from the egg

    7. Phases of Meiosis Meiosis undergoes interphase just like mitosis. At the beginning of meiosis the cell is a diploid (2n) just like mitosis During meiosis the cells divide twice producing 4 haploid (1n) cells that are different from the original cell.

    8. Stages of Meiosis 2 Stages of Meiosis Meiosis I Meiosis II

    9. Stage 1 of Meiosis Prophase I Spindle fibers appear Nucleus and nucleolus disassemble Homologous chromosomes pair up for crossing over

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