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  • 1. Variation
  • 2. How might he describe this classroom of humans to his people? Imagine an alien is visiting Earth for the first time. What differences might he see between all of us?
  • 3. How do we divide up all the living things on Planet Earth? Animalia Chordata Mammalia Carnivora Canidae Canis C. lupis
  • 4. How do we decide if living things are the same or a different species? A mule is a sterile offspring: can’t produce offspring of it’s own Donkey X Donkey Donkey X Horse Mule Horse X Horse
  • 5. Lion x tiger Sterile Horse x zebra Sterile L i g e r Z e b r o r s e
  • 6. Fertile : able to produce offspring L a b r a d o o d l e Labrador x Poodle
  • 7. A species is a group of living organisms which share the same general physical characteristics and can mate to produce fertile young. Can we define a species now?
  • 8. A Species -Define a species. -Give examples of animals of the same species reproducing to produce offspring. -Give examples of animals that are not the same species reproducing to produce offspring. -State the key difference between these offspring. Notes
  • 9. Variation Although all members of a species are very similar, there are differences in their features – variation Activity In your groups pick any species of mammal and list variations in their features.
  • 10. Variations between individuals of a species fall into two categories:
    • 1) Discontinuous variation:
    • - Characteristics fall into distinct groups
    • Sometimes there are only two forms of a
    • characteristic.
    Discontinuous or Continuous Can you think of any human features that fit into groups?
  • 11. Examples of discontinuous variation: Other species: -Smooth or wrinkled pea coat -White or red eyes in fruit flies -flower colour in sweet peas Ear lobes attached unattached Blood Groups O B A AB Tongue rolling Roller Non-roller
  • 12. 1) Continuous variation: - Characteristics which do not show clear cut differences (show a range of differences). What features might show a range of variation? Number of petals on a daisy Heart rate Height
  • 13. Discontinuous data Continuous data Distinct data can be presented as a bar graph. Ranges of data can be presented as a histogram or line graph. No. of pupils Tongue rolling ability Roller Non-roller Pea seed shoot lengths (mm) No. of seeds 1-5 6-10 11-15 16-20 21-25
  • 14. Continuous and Discontinuous Variation
    • Use what you have learned to explain the two types of variation.
    • Your description should include:
    • examples of each
    • the matching cut out graph
    Notes