Continuous and discontinuous variation Quiz
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1. Which of the following is an example of discontinuous variation in humans?
- A. Height
- B. Blood type
- C. Skin colour
- D. Weight
2. A population of beetles shows colour variation due to both genetic differences and different environmental temperatures. What does this demonstrate?
- A. Variation is caused only by genetic factors
- B. Variation is caused only by environmental factors
- C. Variation results from a combination of genetic and environmental causes
- D. Evolution occurs within one generation
3. In natural selection, what is meant by 'survival of the fittest'?
- A. The strongest individuals always survive and reproduce
- B. Organisms that are best adapted to their environment are more likely to survive and pass on their genes
- C. Only the largest organisms in a population can reproduce
- D. Natural selection only occurs during harsh environmental conditions
4. How does the development of antibiotic resistance in bacteria provide evidence for evolution?
- A. It shows that bacteria can change their DNA intentionally when exposed to antibiotics
- B. It demonstrates natural selection acting over a short timescale, where antibiotic-resistant variants survive and reproduce whilst non-resistant bacteria are eliminated
- C. It proves that all bacteria are genetically identical
- D. It shows that evolution requires millions of years and cannot occur within human timescales
5. Selective breeding and natural selection both lead to changes in allele frequencies within populations. What is a key difference between these two processes?
- A. Selective breeding is directed by humans choosing which organisms reproduce, whilst natural selection is driven by environmental pressures and differential reproductive success
- B. Natural selection only occurs in wild populations whilst selective breeding only occurs in laboratories
- C. Selective breeding produces genetic variation whilst natural selection removes it
- D. Natural selection is faster than selective breeding at producing desirable traits