variation-1

variation-1 - Within a species there is usually a great...

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Within a species there is usually a great deal of variation between individuals
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© Jane Burton These snails are all the same species ( Cepaea nemoralis) but they vary considerably What variations can you see ? 2
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The snails’ shells vary in the presence or absence of bands the number of bands their colour 3
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© Biophoto Associates These tiger moths are from the same family What variations can you see? 4
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The uppermost moth is larger than the other two The dark bands on the abdomen differ in number and thickness The patterns of the forewings are quite different from each other The number, shape and distribution of the black spots on the hind wings differ The amount of orange colour in the hind wings varies 5
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You will already be familiar with many of the variations between individuals of the human species ( Homo sapiens ) 6
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There are variations in skin colour, hair colour, hair curliness, eye colour and sex What variations can you see ? 7
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Variations may be inherited or acquired Inherited variations result from the activity of genes They are genetically controlled Genetically controlled variations cannot be altered For example, hair colour, skin colour*, blood group, finger prints and sex cannot be changed naturally 8
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Acquired characteristics result from an individual’s activities or nutrition or from environmental conditions during a lifetime Examples of acquired conditions in humans are* language obesity athletic skills mental skills body building sun tan Acquired characteristics cannot be inherited 9
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variation-1 - Within a species there is usually a great...

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