Biology Unit 3

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socaitwaslike
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145795
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Biology Unit 3
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2012-04-04 22:21:19
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biology unit 3
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  1. Division of eurkaryotic cells into two identical cells is called?
    Mitosis
  2. Mitosis and meiosis are divisions of the?
    Nucleus and chromosomes
  3. What kinds of cells are not associated with meiosis?
    somatic cells (body cells)
  4. What are chromatids that are attached at the centromere called?
    sister chromatids
  5. What are proteins called that resemble spools on which DNA molecules are wound?
    histones
  6. What are portions of a DNA molecule wound around a spool of histone protein called?
    Nucleosome
  7. What is the number of DNA molecules in a duplicated chromosome?
    2
  8. What is unique about chromosomes in a eukaryotic cell?
    the number of chromosomes is the same for all members of a species
  9. When does DNA replication occur?
    between the gap phases of interphase
  10. When are chromosome and genes replicated?
    Interphase
  11. During what stage of the cell cycle are chromosomes duplicated?
    Sphase
  12. What is the interval before the onset of DNA
    replication called?
    G1 phase
  13. What is the stage just preceding nuclear and
    cytoplasmic division?
    G2 phase
  14. How many sister chromatids are present after duplication?
    40
  15. If a parent cell has 20 chromosomes, then each
    daughter cell will have how many chromosomes?
    20.
  16. What are cells called with two of each kind of
    chromosome
    diploid
  17. The spindle apparatus composed of what
    microtubules
  18. When does the spindle apparatus begin to become
    visible
    Prophase
  19. When are the chromosomes aligned at the spindle
    equator
    Metaphase
  20. When do the chromatids detach from one another
    and become visibly separate chromosomes
    Anaphase
  21. When do chromosomes move to opposite poles
    Anaphase
  22. When do chromosomes arrive at opposite poles
    Telophase
  23. When does the nuclear membrane reform
    Telophase
  24. What are the correct stages of mitosis in order
    PMAT
  25. When is the distribution of cytoplasm to
    daughter cells accomplished
    cytokinesis
  26. What is the tissue mass called that forms when
    cells do not respond to normal controls over growth and division
    tumor
  27. What are unusual growths of cells that do not
    pose a threat to surrounding tissues called
    benign
  28. What is the spread of cancer from one site to
    another in the body called
    metastasis
  29. What are some typical sites for the occurrence
    of meiosis
    ovaries
  30. What does sexual reproduction result in
    new combinations of genetic traits
  31. What are alleles
    different forms of the same gene
  32. What are some things that happen during meiosis
    • -genes are shuffled
    • -parental DNA is divided and distributed to forming gametes
    • -diploid chromosome # is reduced to haploids
    • -offspring are provided with new gene combinations
  33. Chromosomes of a pair of homologous chromosomes
    may differ from other chromosomes in terms of what
    size, shape, alleles they carry, postition of the centromere
  34. In meiosis, when do sister chromosomes separate
    from each other
    Anaphase II
  35. Know what the different stages of mitosis and meiosis look like.
    page 147, pg 164, pg 158
  36. When does crossing over occur
    Prophase I
  37. Which phase of meiosis will the chromosomes
    appear as packets of four chromatids
    Prophase I
  38. In anaphase, what are the chromosomes beginning
    to do
    chromosomes move apart
  39. In what stage are paired homologous chromosomes
    found at the equatorial plate
    Metaphase I
  40. How many molecules of DNA are present in a
    developing human sperm cell at the beginning of prophase I
    92
  41. When does major gene reshuffling take place
    Prophase I
  42. What ultimately happens to sister chromatids of each chromosome during meiosis II
    sister chromatids are seperated from each other
  43. How many haploid cells are the result of meiosis
    4
  44. Know what the end products of oogenesis and spermatogenesis
    are called
    4 sperm, lovum and 3 polar bodies (pg. 163)
  45. When does pairing of homologues occur in meiosis
    Prophase I
  46. During what phase do homologues separate
    Anaphase I
  47. What are examples of haploid cells? What is an
    example of a diploid cell
    • Haploid: spore, egg, sperm, gametophyte.
    • Diploid: Zygote
  48. Know the order of stages in reproduction and
    development
    Gamete, Fert, Cleavage, Gastrulation, organ formation, growth
  49. What is a single-layered, fluid-filled ball of
    cells called
    Blastula
  50. What process produces the blastula
    Cleavage
  51. What process produces an embryo with primary
    tissue layers
    Gastulation

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