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General Biology: Meiosis, Plant Life Cycles, and Reproduction

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Termini in questo insieme (17)

  • When is the chromosome number reduced during meiosis?
    During anaphase I of meiosis I, homologous chromosomes are separated, reducing the chromosome number from diploid (2n) to haploid (n).
  • What happens to sister chromatids during meiosis II?
    In meiosis II, sister chromatids are separated, similar to mitosis, but the chromosome number remains haploid.
  • What is alternation of generations in plants?
    It is a life cycle alternating between a multicellular diploid sporophyte and a multicellular haploid gametophyte stage.
  • How do haploid gametophytes form in flowering plants after meiosis?
    Haploid spores produced by meiosis undergo mitosis to form multicellular haploid gametophytes.
  • When does mitosis occur in the sporophyte generation?
    The diploid sporophyte undergoes mitosis for growth and development, maintaining the diploid chromosome number.
  • When does meiosis occur in the sporophyte generation?
    Meiosis occurs in specialized sporophyte cells to produce haploid spores that develop into gametophytes.
  • What features do all sexual life cycles share?
    All involve meiosis to produce haploid cells and fertilization to restore diploidy, alternating between haploid and diploid stages.
  • What are advantages of asexual reproduction?
    Asexual reproduction allows rapid population growth, requires less energy, and produces genetically identical offspring.
  • What are advantages of sexual reproduction?
    Sexual reproduction increases genetic diversity, enhancing adaptability and survival in changing environments.
  • What does 'haploid multicellular organism' mean?
    It refers to the gametophyte stage in plants and some algae, a multicellular organism with one set of chromosomes (n) producing gametes by mitosis.
  • What is a tetrad in meiosis?
    A tetrad is a group of four chromatids formed by the pairing of two homologous chromosomes during prophase I.
  • What is synapsis during meiosis?
    Synapsis is the pairing of homologous chromosomes during prophase I, enabling tetrad formation.
  • What is crossing over in meiosis?
    Crossing over is the exchange of genetic material between non-sister chromatids of homologous chromosomes, increasing genetic diversity.
  • What are chiasmata?
    Chiasmata are the physical sites where crossing over occurs between homologous chromosomes.
  • What is a polar body in mammalian oogenesis?
    A polar body is a small cell produced during oogenesis that contains little cytoplasm and usually does not function as a gamete.
  • How many polar bodies are produced during mammalian egg development?
    Typically, three polar bodies are produced during the two meiotic divisions of oogenesis.
  • Why are polar bodies formed during oogenesis?
    Polar bodies form due to unequal cytoplasm division, ensuring the ovum retains most cytoplasm for development.