Skip to main content
Back

Divisão celular

Control buttons has been changed to "navigation" mode.
1/21

Terms in this set (21)

  • What is cell division?
    Cell division is the process by which a cell divides to form two or more daughter cells.
  • What are the two main types of cell division?
    The two main types are mitosis and meiosis.
  • What occurs during mitosis?
    Mitosis occurs in somatic cells, producing 2 genetically identical daughter cells with the chromosome number maintained (2n > 2n).
  • What is the function of mitosis?
    Mitosis functions in growth, tissue repair, and asexual reproduction.
  • What occurs during meiosis?
    Meiosis occurs in germ cells, producing 4 genetically different daughter cells with chromosome number halved (2n > n).
  • What is the importance of meiosis?
    Meiosis is important for gamete formation and increasing genetic variability.
  • What are the main phases of the cell cycle?
    The cell cycle includes interphase (G1, S, G2 phases) and the mitotic phase (mitosis and cytokinesis).
  • What happens during interphase?
    During interphase, the cell grows (G1), duplicates DNA (S), and prepares for mitosis (G2).
  • List the four main stages of mitosis.
    The four main stages are prophase, metaphase, anaphase, and telophase.
  • What occurs during prophase in mitosis?
    Chromatin condenses into chromosomes, spindle fibers form, and the nuclear envelope breaks down.
  • What happens during metaphase in mitosis?
    Chromosomes align at the cell's equatorial plate, attached to spindle fibers.
  • Describe anaphase in mitosis.
    Sister chromatids separate and move toward opposite poles of the cell.
  • What occurs during telophase in mitosis?
    Chromosomes decondense, nuclear envelopes reform, and the spindle fibers disappear.
  • What is cytokinesis?
    Cytokinesis is the division of the cytoplasm, resulting in two separate daughter cells.
  • What is the difference between meiosis I and meiosis II?
    Meiosis I is a reductional division (2n > n) separating homologous chromosomes; meiosis II is equational (n > n) separating sister chromatids.
  • What happens during prophase I of meiosis?
    Homologous chromosomes pair up and crossing-over occurs, increasing genetic variation.
  • How many cells result from meiosis and are they genetically identical?
    Meiosis produces 4 haploid cells that are genetically different from each other.
  • How many chromosomes does each daughter cell have after meiosis if the original cell is 2n=46?
    Each daughter cell has 23 chromosomes (haploid, n=23).
  • What is a chromatid?
    A chromatid is one of two identical copies of a duplicated chromosome, joined at the centromere.
  • What is the role of crossing-over in meiosis?
    Crossing-over exchanges genetic material between homologous chromosomes, increasing genetic diversity.

  • Frente

    Verso