Gametogenesis - formation of a pollen grain

• what is found in the anther of a plant

  diploid cells
• what happens to the diploid cells found in the anther

  mitosis and meiosis to form haploid pollen grains
• what happens to the pollen grains that are produced from the anther

  mitosis will occur to produce large numbers of pollen mother cells
• what happens to the pollen mother cells that are produced from the pollen grains

  they undergo meiosis to produce a tetrad of four haploid cells
• what do the tetrad of four mother cells form

  pollen grains that contain the male gamete
• how do the tetrad of four haploid cells form pollen grains (that contain the male gamete)


  they separate
• what is the tapetum layer

  this is a layer of cells around the pollen sac
• what does the tapetum layer provide to the developing pollen grains

  nutrients and regulatory molecules
• what is needed for the formation of the pollen cell wall

  the pollen sac
• what is found in each pollen grain

  a haploid nucleus
• what happens to the haploid nucleus inside a pollen grain

  it will undergo mitosis to produce tow nuclei
• what two types of nucleus are made when the haploid nucleus of a pollen grain undergoes meiosis

  a generative nucleus and a pollen tube nucleus
• what will happen to a generative nucleus after it has been produced

  it will later undergo mitosis to give rise to two male nuclei
• what is the name for the outer pollen cell wall

  exine
• describe the outer pollen cell wall(exine)

  tough and resistant to chemicals
• what does it mean by the pollen cell wall being resistant to desiccation


  it is resistant to drying out
• what does it mean by pollen being resistant to UV radiation

  this means that pollen can be carried at high altitudes without DNA mutation occurring
• what type of pollen dispersal method is pollen being resistant to UV radiation be particularly important

  wind pollination
• what is the intine

  the internal side of the pollen cell wall