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L20 The sexual cycle, meiosis and the value of sex

Mer Scott 14 preguntas

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Preguntas del test (14)

  1. 1Choose the incorrect statement about the sexual cycle.
    1. AAdult eukaryotic cells are diploid.
    2. BCells in the ovaries and testes are the only cells which undergo meiosis.
    3. CGametic cells are diploid.
    4. DThe ovum or sperm is haploid.
    5. EWhen an adult gametic cell undergoes mitosis, it is still diploid.
  2. 2Choose the correct statements.
    1. ATwo gametes which are haploid fuse to make a diploid zygote.
    2. BMeiosis halves the number of of chromosomes going into gametes.
    3. CMitosis creates two haploid daughter cells.
    4. DMeiosis creates four diploid daughter cells.
  3. 3Meiosis I separates sister chromatids.
    1. AVerdadero
    2. BFalso
  4. 4Choose the incorrect statement about Meiosis I.
    1. ACrossing over occurs between homologous pairs during metaphase.
    2. BFour sister chromatids form a tetrad in prophase.
    3. CCrossing over occurs at a chiasmata, the joining of a locus on each chromatid.
    4. DIn anaphase I, sister chromatids remain attached when the spindles shorten.
  5. 5Meiosis I produces two diploid cells.
    1. AVerdadero
    2. BFalso
  6. 6Choose the statements about Meiosis II that are false.
    1. ATwo haploid cells with doubled chromosomes enter prophase II.
    2. BCrossing over occurs between sister chromosomes during prophase II.
    3. CIn anaphase II, sister chromatids are pulled apart.
    4. DAt the end of telophase II, two haploid cells are present.
  7. 7There are no chiasmata formed in mitosis.
    1. AVerdadero
    2. BFalso
  8. 8If the sperm of a mouse has 3 picograms of DNA,
    the amount of DNA in the nucleus of a somatic cell
    about to divide by mitosis would be:
    1. A3pg
    2. B6pg
    3. C12pg
    4. D24pg
  9. 9The structures that move to the spindle poles at
    anaphase of meiosis I usually differ from those that
    move to the poles at anaphase II with respect to:
    1. Achromatid number
    2. Bgene copy number
    3. Cthe ratio of maternal to paternal genes
    4. Dall of the above
  10. 10In males, diploid [blank_start]primary[blank_end] spermatocytes undergo meiosis [blank_start]I[blank_end] to produce two [blank_start]haploid[blank_end] secondary spermatocytes. These undergo meiosis [blank_start]II[blank_end] to form haploid spermatids, or, sperm. Tens of [blank_start]millions[blank_end] of these can be produced per day.
    In females, 500,000 [blank_start]diploid primary[blank_end] oocytes are present in a six month old fetus. These begin meiosis I but are suspended in [blank_start]prophase I[blank_end] until ovulation. After ovulation, meiosis I [blank_start]finished[blank_end] and produces two haploid cells, one becomes a [blank_start]secondary[blank_end] oocyte and the other becomes the first polar body. The first polar body is suspended in [blank_start]metaphase II[blank_end] until fertilisation, upon which it completes meiosis II and makes two [blank_start]haploid polar bodies[blank_end]. The secondary oocyte undergoes meiosis II to produce the fourth polar body, and the [blank_start]ovum[blank_end], which are both haploid. [blank_start]Less[blank_end] than 500 ovum will be produced in the female lifespan.
    1. Aprimary
    2. BI
    3. Chaploid
    4. DII
    5. Emillions
    6. Fthousands
    7. Gdiploid primary
    8. Hprophase I
    9. Ifinishes
    10. Jsecondary
    11. Kmetaphase II
    12. Lhaploid polar bodies
    13. Movum
    14. NLess

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Descripción
• Explain what the sexual cycle is. • Identify the structures of meiosis. • Summarise the order of events in meiosis. • Compare and contrast the events that occur in meiosis and mitosis. • Illustrate how meiosis leads to gametic and zygotic diversity
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