Biology Ch9

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  1. Who was Pierre Joseph Van Beneden?
    He was a Belgain cytologist who was observing cells in different roundworms.
  2. What did Van Beneden propose in 1887?
    That an egg and a sperm each containing half the complement of chromosomes found in other cells, fuse to produce a single cell called a zygote
  3. What is fertilization? Or syngamy?
    The fusion of gametes to form a new cell
  4. Meiosis
    is a form of cell division in which the number of chromosomes is halved during gamete formation.
  5. Diploid cells
    Having two sets of chromosomes
  6. Haploid cells
    Has one set of chromosomes.
  7. Sexual Reproduction
    reproduction that involves the alternation of meiosis and fertizilation.
  8. Asexual Reproduction
    reproduce by mitotic division and does not involve the fusion of gametes.
  9. True or False- Some organisms are able to reproduce both sexually and asexually
  10. (fill in)  When haploid cells encounter environmental stress haploid cells sometimes fuse with other haploid cells to form diploid cells but the cell will later undergo ------- to reform into the haploid phase
  11. Somatic cells
    All the diploid body cells of an animal that are not involved in gamete formation
  12. Germ-line cells
    gamete-producing, diploid. and undergo meiosis producing haploid gametes
  13. Meiosis I
    serves to seperate the homologous chromosomes.
  14. Meosis II
    Serves to seperate the sister chromatids
  15. At the end of meiosis you end up with --- haploid cells
  16. Because there was --- replication of DNA but --- cell divisions the process reduces the number of chromosomes by half.
  17. Meosis I and meosis II have how many stages
    They each have 4 stages
  18. Stages of meiosis I are...
    • Prophase I
    • Metaphase I
    • Anaphase I
    • Telophase I

    think P-MAT
  19. The final result of meiosis II is
     4 cells containing haploid sets of chromosomes
  20. Synapsis is
    A junction between a neuron and another neuron or muscle cell. The 2 cells do not touch. Neurotransmitters cross the narrow space between them.
  21. Reduction division
    the chromosome homologues do not replicate between the 2 nuclear divisions.
  22. Image Upload 1
    the differences between meiosis and mitosis
  23. In animals the majority of their life cycle is devoted to the_____stage
  24. Protists spend most of their life cycle in the ____ stage
  25. Plants spend time equally between ______ and _____ stage
    haploid and diploid stage
  26. When male gamete meets female gamete they combine to make a
Card Set:
Biology Ch9

for exam3
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