A) Variation
- 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