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Cambridge IGCSE Biology practice

Paper 3 structured question: Selection

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Selection

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Paper 3Theory (Core)2 marks

Selective breeding is used by humans to improve plants and animals by choosing individuals with favorable traits to reproduce.

Description

Selective Breeding Process

Humans select individuals with desirable traits and mate them. From their offspring, those showing the desired traits are chosen for further breeding.

  1. a

    Describe how humans choose individuals for selective breeding.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe what happens after the selected individuals are mated in selective breeding.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Selection

Paper 3Theory (Core)2 marks

Description

Selective Breeding Overview

Humans select individuals with favorable traits to mate. Their offspring are then selected if they show the desired traits. This process is repeated to enhance traits.

  1. a

    Identify one reason why humans select offspring with desired traits in selective breeding.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    State one example of a trait that might be selected for in animals during selective breeding.

    Aim for approximately 1 distinct marking point.

    [1]