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Cambridge IGCSE Biology practice

Paper 6 structured question: Variation

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6

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4

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Topic

Variation

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Paper 6Alternative to PracticalPractical4 marks

Results from measuring variation in pea plants

Results Table

Variation in pea plant traits

The table shows the number of pea plants with different seed shapes and seed weights measured in a sample of 50 plants.

Seed shapeNumber of plantsSeed weight (g)
Round305.2
Wrinkled204.8
  1. a

    Describe the type of variation shown by seed shape and seed weight.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Suggest why it is important for plant breeders to understand both types of variation.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 6 structured question: Variation

Paper 6Alternative to PracticalPractical5 marks

Method

Method to investigate variation in human traits

A class measures the height and records the blood group of 30 students. Heights are measured using a meter rule to the nearest millimeter. Blood groups are identified from medical records. The independent variable is the trait type (height or blood group). The dependent variable is the measurement or category recorded. Control variables include measuring height at the same time of day and using the same equipment.

StepDescription
1Measure height of each student using a meter rule.
2Record blood group of each student from medical records.
3Repeat measurements to ensure accuracy.
4Record data in a table.
5Analyze data to identify variation type.
  1. a

    Identify the independent and dependent variables in this investigation.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Explain how the data collected can show continuous and discontinuous variation.

    Aim for approximately 3 distinct marking points.

    [3]