Variation and Evolution Practice Questions

Question 1

Q1. Knowledge Recall (1 mark)

Define the term "allele".

Question 2

Q2. Application (2 marks)

Explain why a brown-eyed parent and a blue-eyed parent can have a child with green eyes.

Question 3

Q3. Data Analysis (3 marks)

The table shows the variation in beak length of two bird species:

Species

Mean Beak Length (mm)

Species A

5.5

Calculate the difference in mean beak length between the two species.

Question 4

Q4. Knowledge Recall (2 marks)

Describe how natural selection acts on a population.

Question 5

Q5. Application (3 marks)

Explain how genetic variation can affect an individual's susceptibility to disease.

Question 6

Q6. Data Analysis (4 marks)

The diagram shows a mutation in a DNA sequence:

Normal sequence: CCATTGGA

Mutated sequence: CCATCGGA

Explain how this mutation could affect the production of a protein.

Question 7

Q7. Knowledge Recall (1 mark)

What is the role of homologous structures in supporting the theory of evolution?

Question 8

Q8. Application (2 marks)

Explain how speciation can occur through geographic isolation.

Question 9

Q9. Data Analysis (3 marks)

A study found that 50% of a population of insects were resistant to a particular pesticide. After the pesticide was repeatedly used over several generations, the proportion of resistant insects increased to 80%. Explain how this could be an example of natural selection.

Question 10

Q10. Knowledge Recall (2 marks)

Describe the importance of biodiversity for maintaining ecosystem stability.

Species B

8.2

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