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Explain natural selection by discussing: (a) genetic diversity within groups (b) the generation of numerous offspring (c) the competition for survival, including resource competition (d) the increased likelihood of reproduction for individuals that are more suited to their environment (e) how these individuals transmit their alleles to future generations

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Cambridge IGCSE BiologyVariation and selectionCore content

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Explain natural selection by discussing: (a) genetic diversity within groups (b) the generation of numerous offspring (c) the competition for survival, including resource competition (d) the increased likelihood of reproduction for individuals that are more suited to their environment (e) how these individuals transmit their alleles to future generations

  • This point belongs to Selection, especially Selection outcomes.
  • You need to be able to explain natural selection by discussing: (a) genetic diversity within groups (b) the generation of numerous offspring (c) the competition for survival, including resource competition (d) the increased likelihood of reproduction for individuals that are more suited to their environment (e) how these individuals transmit their alleles to future generations.
  • The key ideas to know are Describe.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

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Describe

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Paper 3 structured question: Selection

Paper 3Theory (Core)3 marks

Description

Rabbit Population

A population of rabbits lives in an area with limited food resources. Some rabbits have a genetic trait that allows them to digest a wider variety of plants.

  1. a

    Describe how genetic diversity affects the rabbit population's survival.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    State the role of advantageous traits in natural selection.

    Aim for approximately 1 distinct marking point.

    [1]
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