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Meiosis and Mitosis in General Biology

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  • What is mitosis?

    Mitosis is a type of cell division that results in two genetically identical daughter cells, maintaining the same chromosome number as the parent cell.

  • What is meiosis?

    Meiosis is a type of cell division that reduces the chromosome number by half, producing four genetically diverse haploid cells.

  • Purpose of mitosis

    Mitosis is used for growth, tissue repair, and asexual reproduction in organisms.

  • Purpose of meiosis

    Meiosis produces gametes (sperm and egg cells) for sexual reproduction, ensuring genetic diversity.

  • Number of daughter cells produced in mitosis

    Mitosis produces two daughter cells.

  • Number of daughter cells produced in meiosis

    Meiosis produces four daughter cells.

  • Chromosome number in daughter cells after mitosis

    Daughter cells have the same diploid chromosome number as the parent cell.

  • Chromosome number in daughter cells after meiosis

    Daughter cells have a haploid chromosome number, half that of the parent cell.

  • Key phases of mitosis

    Mitosis includes prophase, metaphase, anaphase, and telophase.

  • Key phases of meiosis

    Meiosis consists of two divisions: Meiosis I and Meiosis II, each with prophase, metaphase, anaphase, and telophase.

  • What happens during prophase in mitosis?

    Chromosomes condense, the nuclear envelope breaks down, and spindle fibers form.

  • What is crossing over and when does it occur?

    Crossing over is the exchange of genetic material between homologous chromosomes during prophase I of meiosis, increasing genetic variation.

  • Difference between metaphase in mitosis and meiosis I

    In mitosis, chromosomes line up individually; in meiosis I, homologous chromosome pairs line up together.

  • What separates during anaphase of mitosis?

    Sister chromatids separate and move to opposite poles.

  • What separates during anaphase I of meiosis?

    Homologous chromosomes separate, but sister chromatids remain together.

  • Genetic variation in mitosis vs meiosis

    Mitosis produces genetically identical cells; meiosis produces genetically diverse cells due to crossing over and independent assortment.

  • Role of spindle fibers

    Spindle fibers attach to chromosomes and help separate them during cell division.

  • What is independent assortment?

    Random orientation of homologous chromosome pairs during metaphase I of meiosis, leading to genetic variation.

  • When does DNA replication occur in relation to meiosis?

    DNA replication occurs once before meiosis begins, during the S phase of interphase.

  • Difference in cytokinesis between mitosis and meiosis

    Mitosis has one cytokinesis producing two cells; meiosis has two cytokineses producing four cells.