Investigating Variation

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What is interspecific variation?
Variation across different species.
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What is intraspecific variation?
Variation within one species.
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What two main categories cause variation?
Genetic differences and environmental influences.
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Name four environmental influences.
Climactic conditions (sunlight, rainfall, temperature), soil conditions, pH, food availability
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Name three genetic differences and describe how they cause variation.
Mutations - sudden gene changes may or may not be passed down. Meiosis forms gametes and mixes genetic material, all gametes different. Fusion of gametes gives random fertilisation and offspring inherit characteristics.
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The three main genetic differences affect sexually-produced organisms. In asexual reproduction, which one of them only affects organisms?
Mutations.
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What two things interfere with how representative sampling can be.
Chance and sampling bias.
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How do we eliminate sampling bias?
Divide study area into numbered grid, use random number generator to obtain series of coordinates. Take samples at coordinate intersections.
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How do we eliminate chance?
Use large sample size, analyse collected data.
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Other cards in this set

Card 2

Front

What is intraspecific variation?

Back

Variation within one species.

Card 3

Front

What two main categories cause variation?

Back

Preview of the front of card 3

Card 4

Front

Name four environmental influences.

Back

Preview of the front of card 4

Card 5

Front

Name three genetic differences and describe how they cause variation.

Back

Preview of the front of card 5
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