Online worksheet ยท 3 of 4
Populations change over generations - Online practice 3
Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.
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Fictional selection model: drought-tolerant plants during dry conditions. In an earlier population of 100, 25 have the stated inherited variant; in a later generation of 100, 45 have it. Assume inheritance, different reproductive success and no migration in this simplified model. These are supplied numbers, not observations of a real population.
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- Find the variant's percentage in each generation and the percentage-point change from 25 to 45 per 100.
- Explain how the variant in 'drought-tolerant plants during dry conditions' could become more common without individuals choosing to change their genes.
- Do the two counts alone prove selection was the only possible cause in a real population?
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