Identification, Variation, and adaptation

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VARIATION WITHIN A SPECIES 

- If you come across a species but you don't know what it is a key will help to identify it.

- The descriptions in a key come as opposite statements

- Choosing one statement that fits the species will lead you to the next

                                   Image result for organism identification key

- Members of the same species have different characteristics. For example humans vary in their hair colour and blood groups, this is called variation.

- Variation can either be continuous or discontinuous:

  • In continuous variation, characteristics are spread over a range of values, for example height in humans,  their are a range of intemediates (inbetweens) in the values 
  • In discontinuous there are no intermediates, but rather distinct groups for example people who can and can not roll their toungue. 

Image result for discontinuous variation graphImage result for continuous variation graph

EXAM TIP: IF SHOWN GRAPHS OF VARIATION DATA AND ASKED TO IDENTIFY WHICH TYPE IS BEING SHOWN…

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