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Genetic information, variation and relationships between organisms

Genetic information, variation and relationships between organisms

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Question 21

A student used paper chromatography to separate the different pigments extracted from flower petals. They were provided with the following materials:

  • Chromatography paper
  • A ruler and pencil
  • A capillary tube
  • A beaker with a watch glass cover
  • Solvent C
  • 1 cm31\text{ cm}^31 cm3 of the flower petal extract
1.

Describe how the student could use these materials to separate the pigments in the extract.

[4]
2.

When using solvent C, the student separated four distinct pigment spots. When they repeated the method under identical conditions but using a different solvent, D, they separated five distinct pigment spots. Explain the difference between these two results.

[2]
Markscheme

Genetic information, variation and relationships between organisms Questions

  1. A Level
  2. /Biology
  3. /Genetic information, variation and relationships between organisms

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