GCSE Combined Science (AQA)

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Risks of Selective Breeding

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Inheritance, Variation and Evolution Variation and Evolution

Risks of Selective Breeding

2:47 Selective Breeding
Spec 4.6.2.3
Previous Benefits of Selective Breeding Next Genetic Engineering
  • Selective breeding can lead to health issues due to prioritizing appearance or utility traits.
  • Example given: Pugs suffer from respiratory issues, skin infections, eye prolapse, and hip problems due to selective breeding.
  • Selective breeding with negative health impacts is often a result of inbreeding.
  • Inbreeding example: Breeding two related pigs with a desirable trait can increase the likelihood of offspring with recessive genetic disorders.
  • Inbreeding does not create undesirable genes but increases the probability of these genes manifesting in offspring.
  • Ethical concerns arise regarding the limits and implications of selective breeding.
  • Selective breeding can also increase susceptibility to infectious diseases.
  • Example of bananas: Most are from a few selectively bred varieties, making them vulnerable to epidemics due to genetic uniformity.

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