Biology variations

  1. Classification
    placing objects into groups based on similar characteristics
  2. Taxonomy
    the science of classifying things
  3. Species
    A group of similar organisms that are capable of naturally interbreeding with each other to produce fertile offspring
  4. Variation
    within a species means that in a group of successfully interbredding organisms the individual members show diiferent characteristics
  5. Acquired variation plus example
    not inherited but are learned or developed during life

  6. Inherited variation and example
    are controlled by genes

    eye colour
  7. What does sexual reproduction do?
    causes genetic variation to occur

    crossing over occurs allows genes to be exchanged

    in fertilization the random assortment of genes
  8. Mutations
    a spontaneous/sudden change in the amount/structure of DNA
  9. Mutagens
    agents that cause mutations

    • gamma radiation
    • formaldehyde
  10. Chromosome mutation
    A large change in the structure of one or more chromosomes
  11. Evolution
    the way in which living things change genetically to produce new forms of life over long periods
  12. Darwins and Wallace's theory of evolution
    • Ob1: overbreeding
    • Ob2: population numbers remain constant
    • C1:There is struggle existence
    • Ob3: inherited variations arise in species
    • C2: Natural selection
  13. Natural selection
    The process of which those organisms with genetically controlled characteristics that allow them to be well adapted to their environment will survive and pass on to following generations
  14. Specification
    The production of new species as a result of evolution
  15. Paleontology
    the study of fossils
  16. Fossils
    the remains of something that lived a long time ago (or some mutation of something that lived a long time ago.)
  17. Fossil evidence!
    Life has changed

    life has become more complex

    The changes can be linked to environmental change
Card Set
Biology variations