chapter 8

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cassidy
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59256
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chapter 8
Updated:
2011-01-11 19:13:23
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biology
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  1. in order to fit within a cell, dna becomes more compact by
    wrapping tightly around associated proteins
  2. chromatids are
    dupilicate halves of a chromosome
  3. a protein disk that attaches two chromatids to each other in a chromosome is called a
    centromere
  4. the chromosomes in your body
    • 44 autosomes
    • 2 sex chromosomes
    • 23 pairs
  5. a student can study a karyotipe to learn about the
    number of chromosomes present in a body cell
  6. a diploid cell is one that
    • has 2 homologues of each chromosome
    • has chromosomes found in pairs
    • is designated by the symbol 2n
  7. diploid:bodycell::haploid:
    sex chromosme
  8. the diploid number of chrommosmes ina human skin cell is 46. how many chromosomes are in a humban egg cell
    23
  9. how many chromomsomes are in the body cells of an organisms that has a haploid number of 8
    16
  10. binary fission
    is the process by which bacteria reprodces
  11. the chromosome of bacterium
    has a circular shape
  12. in bacterium cell division takes place when
    the dna is copied, a new cell membrane forms between dna copies and the cell splits into two cells
  13. the stage of the cell cycle that occupies most of the cells life is
    interphase
  14. which of the following shows the correct sewquence of the cell cycle
    g1, s, g2, m, c
  15. growth: g1::
    dna copying :S
  16. metaphase: prophase:;
    g2, s
  17. the phase of mitosis that is characterized by the arrangement of all chromosomes along hte equator of the cell is called
    metaphase
  18. a typical human cell contains 46 chromosomes after mitosis and cytokinesis each of the two new cells formed from a original cell
    has a complete set of 46 chromosomes
  19. as a result of mitosis each of the two new cells produced from the original cell during cytokinesis
    recieves an exact copy of all chromosomes present in the original cell
  20. in plant cells cytokinesis occurs when
    a new cell wall forms
  21. mitosis is a process by which
    a cells mucleus divided
  22. separation of homologues occurs during
    meiosis 1
  23. dteh difference between anaphase of mitosis and anaphase 1 of meiosis is that
    chromatids do not seperate at the entromere in anaphashe1
  24. when crossing over takes place chromosomes
    exchange corresponding segmands of DNA
  25. THE EXCHANGE OF SEGMENTS OF DNA BETWEEN THE MEMBERS OF A PIAR OF CHROMOSOMES
    ACTS AS A SOURCE OF VARIATIONS WITHIN A SPECIES
  26. following replication of its dna ach chromosmoe contains two_____which are attached to each other by a cnentromere
    chromatids
  27. chromomsomes that are not involved in sex determination are called
    autosomes
  28. a picture of a cells chromosome is called a
    karyotype
  29. ______is the process by which bacteria split asexually into two identical organisms
    binary fission
  30. in bacteria, cell division takes place in two stages, first the ___ is compied and then the cell splits
    dna
  31. the sequence of events that occurs in the cell form one mitotic division to the next is called the
    cell cycle
  32. collectively the time spent in the g1+s+g2 is called
    interphase
  33. microtubules that extend form the poles of a cell to the centromeres during cell division are called
    spindle fibers
  34. in mitosis anaphase follows
    metaphase
  35. chromsomes cil up into short rods during
    prophase3
  36. during cell division plant cells fomr a new____in the center of the cell
    cell plate
  37. in eukaryotic cellss_____ takes place after the nucleus divides
    cytokenesis
  38. the stage of meiosis during which homologues line up along the equator of the cell is alled
    metaphase 1
  39. after a new nuclear membrane forms during telophase of mitosis or meiosis the ....divides resulting in two cells
    cytoplasm
  40. the process called ____ guarentess that the nubmer of chromosmoes in gametes is half the number of chromosmeons in body cells
    meiosis
  41. a reprocal exchange of corresponding segments of DNA is called
    crossing over
  42. the cells resulting form meiosis in either males of females are called
    gametes
  43. as result of spermatogenesis four cells are produced that can alld evelop into sperm cells as result of oogensisi only ___ celldevelops into an egg cell
    1
  44. anapahse 2
    centromere splits
  45. prophase 1
    homologs match up
  46. telophase 1
    first polar body formed
  47. anaapahse
    homologous chromsomes seperate
  48. prophase 1
    crossing over may occur
  49. telophase 2
    spermatids are an ovum is produces

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