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5 Written questions

5 Matching questions

  1. Somatic Cells
  2. Fertilization
  3. Cytokinesis
  4. Homologous Chromosomes
  5. Synapsis
  1. a - 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
  2. b chromosomes that code for the same trait, one inherited from each parent
  3. c homologous chromosomes come together and intertwine
  4. d - 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
  5. e - 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

5 Multiple choice questions

  1. where sperm acquire motility and stored here till ejaculation
  2. chromosome consisting of two sister chromatids
  3. - sperm and egg
    - produced in gonads
  4. - lower, narrow end of the uterus
    - connects with the vaginal canal
  5. - spermatids after a series of changes, becomes a mature sperm
    - mature sperm is an elongated cell with a head, neck, body and tail
    - head consists almost entirely of the nucleus
    - tail (flagellum) propels the sperm
    - mitochondria in the neck and body provide energy for locomotion

5 True/False questions

  1. G₁ Stage (presynthetic gap)- intense biochemical activity and growth
    - cell doubles in size and new organelles are produced
    - passing "restriction point", where a cell is committed to continue through the rest of the cell cycle and divide
    - some cells like skeletal muscle cells and nerve cells never pass this point, and enter a nondividng phase sometimes referred to as G₀
    - 2N number of chromosomes

          

  2. Metaphase- homolgous pairs (tetrads) align at the equatorial plane
    - each pair attaches to a separate spindle fiber by its kinetochore

          

  3. Zona Pellucida- multilayered sac of cells that contains, nourishes and protects and immature ovum
    - follicle cells produce estrogen

          

  4. Telophase II- a nuclear membrane forms around each new nucleus
    - each chromosomes still consists of sister chromatids joined at the centromere
    - cells divide into two daughter cells
    - between cell divisions, there might be "interkinesis", a short rest period where chromosomes partically uncoil

          

  5. Dizygotic (fraternal) Twin- 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