Biology Sec 2

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Biology Sec 2
2011-10-18 00:41:09

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  1. In Meiosis I what seperstes?
    Homologous chromosomes
  2. In Meiosis II What separates?
    sister chromatids
  3. What are the two stages of Meiosis?
    • Prophase- crossing over
    • Metaphase- random assortment
  4. Prophase
    crossing over
  5. Metaphase
    Random assortment
  6. What is Chromatin
    A mixture of histone protein and DNA
  7. Correct base pairings
    • C -G
    • T -A
  8. Each individual chromosome st the beginning of mitosis is composed of
    2 sister chromatins
  9. During which phase of interphase does DNA replication occur?
  10. Which cell cycle is associated with CHECK, REPAIR OR DIE??
  11. During which phase of mitosis does chromatin begin to condense to form the chromosomes?
  12. in plants, the formation of the cell plate occurs during?
  13. Interphase consists of
    G1 + S + G2
  14. Cells produced by meiosis sre called
  15. How do mitosis and meiosis differ from each other?
    • Cells formed by mitosis are diploid
    • Cells formed by meiosis are haploid
  16. What os decreased during the process of meiosis?
    The number of chromosomes
  17. The genetic make up of an inividual is called his/her
  18. what separated in anaphase of mitosis?
    Sister chromosomes
  19. During meiosis 1 what separates?
    Homologous chromosomes
  20. During meiosis 2 wha tseparates?
    Sister chromatids
  21. Crossing over and exchange of genetic material occur in what?
    Prophase of meiosis I
  22. Genes located close together on the same chromosome are referred to as
  23. Linked genes generally do not
    sort inependently during meiosis.
  24. The phase of meiosis associated with crossing over homologous chromosomes is??
    Prophase I
  25. Number of chromosomes in parent cell in MITOSIS?
    (meiosis 30)
  26. Number of chromosomes in parent cell in MEIOSIS?
    (mitosis 30)
  27. Number of daughter cells in MITOSIS?
    (meiosis 4)
  28. Number of daughter cells in MEIOSIS?
    (mitosis 2)
  29. Total number of chromosomes in each aughter cell MITOSIS?
    (meiosis 15)
  30. Total number of chromosomes in each daughter cell MEIOSIS?
    (mitosis 30)
  31. Mitosis type of daughter cell
  32. Meiosis type of daughter cell
  33. Somatic Cell
    Any cell of a living organism other than the reproductive cells
  34. homologous chromosome
    • A pair of chromosomes containing the same linear gene sequences, each derived from one parent
    • Chromosomes that synapse during meiosis. Such chromosomes are identical with regard to their genetic loci and centromere placement
  35. diploid
    (of a cell or nucleus) Containing two complete sets of chromosomes, one from each parent.
  36. haploid
    (of a cell or nucleus) Having a single set of unpaired chromosomes
  37. Difference between meiosis and mitosis
    meiosis - cell divides but chromosomes are not duplicated. the product is two haploid cells with slightly different DNA (due to crossing over of chromosomes when they line up in metaphase)mitosis - cell divides into two identical daughter cells. if the mother cell is diploid, the two daughter cells will be too
  38. difference between meiosis and mitosis
    mitosis occurs in somatic cells while meosis occur in germ cells.also the daughter cell in mitosis is replica of parent cell in genome while the daughter cell in meosis isn`t.
  39. Alleles
    Alleles are the different types of genetic material that code for a specific protein - or gene
  40. Genotype
    • genetic make up and phynotype is morphologycal or physical appearance.
    • (what square is made up of mom & dad)
  41. Phenotype
    • Results of genotype
    • (inside square)
  42. Plieotropy
    In pleiotropy, on the other hand, one gene is responsible for multiple things. Several congenital syndromes are examples of pleiotropy, in which a flaw in one gene causes widespread problems for a person. For example, sickle cell anemia is a form of pleiotropy, caused by a distinctive mutation in one gene which leads to a host of symptoms. In addition to causing mutations, pleiotropy also occurs in perfectly normal genes, although researchers tend to use it to track and understand mutations in particular.
  43. Polygenic
    The term “polygenic inheritance” is used to refer to the inheritance of quantitative traits, traits which are influenced by multiple genes, not just one. In addition to involving multiple genes, polygenic inheritance also looks at the role of environment in someone's development.
  44. pleiotropy difference from Polygenic
    Simply put, they are in a sense opposites. A pleiotropic gene is a gene that affects more than one trait, while a polygenic trait is the result of the interaction on several genes.
  45. anaphase
  46. Telophase
    move to opposite ends and nuclei are formed.
  47. Interphase
    Resting phase
  48. Tissue
    has many cells that work together to perform the tissues function of the body.