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5 Written Questions

5 Matching Questions

  1. What is crossing over? When does it occur? Why is it important?
  2. What is the difference between spermatogenesis and oogenesis?
  3. What is endosymbiotic theory? Which organelles does it apply to?
  4. What is speciation?
  5. Why are inhalants usually the first drug used?
  1. a Crossing over is when homologous chromosomes exchange genetic material by crossing 1 leg over the other breaking off and reattaching to the opposite chromosome.
    Occurs during prophase 1 of meiosis 1.
    Increases genetic variation within a species.
  2. b The theory that some organelles like mitochondria and chloroplasts were ancient bacterial cells that were engulfed by larger cells and their relationship helped both organisms out so they evolved together and that is why they have their own DNA within them
  3. c The link between microevolution and macroevolution, and is the formation of new species
  4. d They are easily accessible
  5. e Spermatogenesis is for males and it goes through meiosis 1 and meiosis 2 to create 4 haploid gametes that change into sperm cells.

    Oogenesis is for females and it goes through 2 stages of meiosis to create 1 ovum and 3 other polar bodies.

5 Multiple Choice Questions

  1. ...
  2. Meiosis 1: 1st phase of meiosis includes crossing over and ends up dividing into 2 diploid cells
    Meiosis 2: 2nd phase of meiosis divides the sister chromosomes into 4 genetically unique haploid cells.
  3. The sequence of amino acids.
  4. Purines are bases of DNA (Adenine and Guanine)
    -composed of 2 rings of carbon and nitrogen per base
    Pyrimidines are bases of DNA (Thymine and Cytosine)
    -composed of one ring of carbon and nitrogen atoms per base
  5. The idea that species do not always evolve gradually but actually pretty quickly as their is a sudden dramatic change in environmental pressures causing an increase in many new species to evolve

5 True/False Questions

  1. What are the steps in DNA replication? How would you describe the final outcome?1) Unwinding and separating DNA strands
    2) Adding complementary bases
    3) Formation of two identical DNA molecules
    Two daughter strands are made of half old and half new


  2. Describe the 4 steps of natural selectionFossil record- shows a pattern of gradual change from past to present

    Biogeography- shows that similar environmental conditions contribute to similar development

    Developmental biology- shows similarity in embryonic development in organisms deriving from a common ancestor

    Anatomy- shows similarity of structures n organisms that are related or descended from a common ancestor

    Biochemistry- similarity in amino acid sequences of proteins or DNA give evidence of common ancestry


  3. What is descent with modification?The idea that breeders may select traits that are more desirable by using only certain types of breeds that have the traits they want


  4. What kinds of mutations can be inherited?Only mutations that are in germ cells are heritable


  5. How does the number of chromosomes in a human gamete vs. a human somatic cell?Human gamete: 23 chromosomes (one sex chromosome and 22 autosomes)
    Human somatic cells: 46 chromosomes (two sex cells and 44 autosomes)
    Somatic cells are twice as big as gametes.


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