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5 Written questions

5 Matching questions

  1. Prophase I
  2. Telophase
  3. Chromatin
  4. S Stage (synthesis)
  5. Cytokinesis
  1. a - happens at the end of telophase
    - cytoplasm divides into two daughter cells
    - in animal cells, a cleavage furrow forms, cell membrane indents along the equator of the cell and cell split
  2. b - each chromosome is replicated so that during division, a complete copy can be distributed to each daughter cell
    - two identical sister chromatids held together at a region called the "centromere"
    - telomeres: ends of the chromosomes
    - 2 x 2N number of chromosomes
  3. c - homologous chromosomes come together and intertwine
    - at this stage, chromosome consists of two sister chromatids
    - where recombination and crossing over happens, responsible for increased genetic diversity
  4. d - spindle apparatus disappears
    - new nuclear membrane forms around each set of chromosomes
    - nucleoli reappears
    - chromosomes uncoil
    - cytokinesis occurs
  5. e - granular DNA during interphase

5 Multiple choice questions

  1. chromosomes that code for the same trait, one inherited from each parent
  2. - results when two ova are released in one ovarian cycle
    - fertilized by two different sperm
    - two embryos implant in the uterine wall individually
    - each develops its own placenta, amnion and chorion
    - share characteristics in the level of siblings
  3. - similar to mitosis
    - not preceded by chromosomal replication
  4. - chromosomes align
  5. - prokaryotes' way of of cell division
    - a type of asexual reproduction
    - splits into two equal halves, each daughter cell receives a complete copy of the original chromosome

5 True/False questions

  1. Zona Pellucida- four stages: G₁, S, G₂ and M
    - interphase: first three stages
    - mitosis includes the actual cell division


  2. Cortical Reaction- 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


  3. Fertilization Membrane- happened 12-24 hours after ovulation
    - occurs in the lateral, widest portion of the fallopian tube
    - sperm travels through vaginal canal, cervix, uterus, and into the fallopian tubes to reach the ovum
    - sperm penetrates corona radiata, then zona pellucida, contact with ovum cell membrane, become acrosomal process, fuse sperm with ovum
    - sperm nucleus enters ovum's cytoplasm and ovum completes meiosis II


  4. Regeneration- the regrowth of a lost or injured body part
    - replacement of cells occurs by mitosis
    - ex: hydra and starfish
    - in higher animals, regeneration is usually limited to the healing of tissues
    - some internal organs (liver) can regenerate considerably as long as part of the organ remains viable


  5. Corona Radiata- outer layer of the oocyte cell membrane


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