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5 Written questions

5 Matching questions

  1. Cortical Reaction
  2. Telophase
  3. Anaphase I
  4. Oogenesis
  5. Somatic Cells
  1. a - production of female gametes
    - occurs in the ovarian follicles
    - one primary oocyte completes meiosis I per month after menarche
    - yields two secondary oocyte and a polar body
    - secondary oocyte is expelled from the follicle during ovulation
    - meiosis II doesn't occur till fertilization
  2. b - spindle apparatus disappears
    - new nuclear membrane forms around each set of chromosomes
    - nucleoli reappears
    - chromosomes uncoil
    - cytokinesis occurs
  3. c - or called autosomal cells
    - everything but the gamete
    - contain diploid number of chromosomes characteristic of its species (2N)
    - N is the number of chromosomes found in haploid cell (gamete)
    - in human, 2N = 46 and N = 23
  4. d - disjunction: homologous pairs separate and are pulled to opposite poles of the cell
    - distribution of homologous chromosomes to intermediate daughter cells are random
  5. e - triggered by acrosomal reaction
    - calcium ions released into the cytoplasm, initates a series of reaction to form the fertilization membrane
    - calcium ion also stimulates increase in ovum's metabolic rate
    - this is followed by fusion of the sperm nucleus with ovum nucleus to form a diploid zygote

5 Multiple choice questions

  1. - chromosomes align
  2. - fusion of two gametes (specialized sex cells produced by each parent)
    - meiosis is the process where the sex cells are produced
    - mitosis preserves the diploid chromosome number while meiosis halves it
    - somatic cells undergo mitosis, gametocytes undergo meiosis
    - during fertilization, two haploid gametes fuse, restoring the diploid number
  3. chromosomes that code for the same trait, one inherited from each parent
  4. - chromosomes condense
    - centriole pairs separate and move toward opposite poles of cell
    - spindle apparatus form
    - nuclear membrane dissolves
    - kinetochores, attached kinetochore fibers, appear at the chromosome centromere
  5. - result when a single zygote splits into two embryos
    - if splitting occurs at the two-cell stage of development, embryos will have separate chorions and separate placentas
    - if it occurs at blastula stage, embryos only have one chorionic sac and share a placenta (and probably amnion)

5 True/False questions

  1. Anaphase II- sister chromatids are pulled to opposite poles by the spindle fibers

          

  2. Meiosis- only occurs in the sex cells
    - meiosis I produces two intermediate daughter cells
    - meiosis II is similar to mitosis, it separates sister chromatids and results in four genetically distinct haploid gametes

          

  3. Pathway of SpermSEVEN UP:
    Seminiferous tubules
    Epididymus
    Vas deferens
    Ejaculatory duct
    (Nothing)
    Urethra
    Penis

          

  4. Chromosome Movement- dependent on these cytoplasmic organelles
    - centrioles: found in pairs, cylindrical organelles
    - centrosome: an area outside the interphase nucleus
    - spindle fibers: composed of microtubules, appears near each pair of centrioles, radiate outward.
    - asters: spidle fibers in radiating structure
    - spindle apparatus: asters extending toward the center of the nucleus, shortens to move chromosomes toward
    opposite poles of the cell during the later stages of mitosis

          

  5. Gonads- male: testes
    - female: ovaries

          

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