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Course: Science — Third Preparatory
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Science — Third Preparatory

Science — Third Preparatory

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Science — Third Preparatory 2026/2027

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Unit 1 - Force, Motion, Acceleration and Physical Quantities

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Unit 3 — Variation of Traits in Living Organisms

Science — Third Preparatory

Unit 3 — Variation of Traits in Living Organisms

2.7 Techniques used in artificial selection

2.7 Techniques used in artificial selection

  • Humans want to keep useful traits to improve production, protect superior breeds and support food security.
  • Two kinds of techniques:
Comparison aspectMain ideaKeywords
Traditional techniques
  • crossbreeding good breeds
  • and choosing the best plants for cultivation
crossbreedinggoodbreedschoosing
Modern techniques
  • preserving gametes (sperm
  • eggs) and tissue culture (growing whole plants from small pieces of plant tissue). Tissue culture produces disease-free plants and supports research and treatment
  • gene banks store gametes
  • cells and valuable breeds for research
  • treatment and the protection of biodiversity
preservinggametesspermeggs
  • Discussion:
  • artificial selection improves breeds and production, but it can also reduce genetic diversity.
  • If all individuals are genetically similar, a single disease or environmental change could affect all of them, and the population might disappear.
  • Therefore breeders and gene banks aim to keep a balance between improvement and diversity.
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