Biology Variation Key Words Cards

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  • Created by: Molly
  • Created on: 23-04-13 13:51
Sampling Bias
When an investigator makes unrepresentative choices about the sample being used, either deliberately or unwittingly.
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Chance
When the sample is biased by chance and not because of sampling bias and so is not representative.
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Random Sampling
When there is no human involvement in the choosing of samples.
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Why is it good to use a large sample size?
Because the more individuals that are selected the smaller is the probability that chance will influence the result of the investigation.
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What is variation the result of?
Genetic differences and environmental influences
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How does genetic variation arrive due to mutation?
The sudden changes in genes/chromosomes can be passed on through generations.
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how does Meiosis cause genetic variation to arise?
This forms gametes which mixes up the genetic material of 2 individuals before they become gametes.
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What is intraspecific variation?
Variation within the same species. E.G A cat but two different types of cat.
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What is intrespecific variation?
When there is variation between two different species, e.g. cat and dog.
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What is standard deviation?
An indication of the range of values at either side of the mean.
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Other cards in this set

Card 2

Front

When the sample is biased by chance and not because of sampling bias and so is not representative.

Back

Chance

Card 3

Front

When there is no human involvement in the choosing of samples.

Back

Preview of the back of card 3

Card 4

Front

Because the more individuals that are selected the smaller is the probability that chance will influence the result of the investigation.

Back

Preview of the back of card 4

Card 5

Front

Genetic differences and environmental influences

Back

Preview of the back of card 5
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