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AQA A-level Biology - Topic 4 questions and answers 100% guaranteed success.

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Define variation - correct answer. Differences that exist between individuals In what ways can variation be caused? - correct answer. It can be caused by genetic factors, such as alleles from mutations. It can also be caused by the environment, such as climate. Most variation is caused by a combination of genetic factors and environmental factors Why is it impossible to study a whole population? - correct answer. Because it is too large and would take too long. Instead, scientists use a sample that is representative of the species' population Why should the sample taken be random? - correct answer. So you can make sure that the sample isn't biased in any way. What could you calculate to look at variation between species? - correct answer. The mean (average) What is standard deviation? - correct answer. It tells you how much values in a single sample vary, by measuring the spread of values about the mean

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Glenn Toole, Susan Toole AQA Biology A Level Student Book
Publisher: 2016 ISBN: 9780198378433 Edition: Unknown

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