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Cambridge IGCSE Biology practice

Paper 3 structured question: Variation

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Variation

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Paper 3Theory (Core)1 marks

Discontinuous variation produces distinct phenotypes with no intermediates.

Description

Examples of Discontinuous Variation

Examples include ABO blood groups in humans and pea seed shape and color.

  1. a

    State one example of a trait that shows discontinuous variation.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Variation

Paper 3Theory (Core)2 marks

Description

Discontinuous Variation in Pea Seeds

Pea seeds can be round or wrinkled in shape and yellow or green in color, with no intermediate forms.

  1. a

    Identify two phenotypes of pea seed shape that show discontinuous variation.

    Aim for approximately 2 distinct marking points.

    [2]