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Combined Science: Biology

GCSE · Edexcel · foundation

QuestionsFlashcards

Disease
Defence Against Disease
Development of Medicines
- Antibiotics
  4
- Discovery & Development of New Drugs
  3
Non-Communicable Diseases
- Lifestyle & Non-Communicable Disease
  7
- Cardiovascular Disease
  6

The Organism in the Environment
Human Influences on the Environment
- Human Impact on Biodiversity
  6
- Benefits of Maintaining Biodiversity
  4
Cycles within Ecosystems

Selective Breeding Flashcards

All 5 cards in this deck

What is selective breeding?: Choosing the organisms with the desired characteristics and breeding them together over many generations.
Give one problem caused by selective breeding.: It reduces genetic variation, so inbreeding can increase the risk of inherited disease.
Name two characteristics that food crops such as wheat are selectively bred for.: High yield (more grain per plant) and disease resistance.
Why could a new disease affect a whole selectively bred population?: Selective breeding lowers genetic variation, so few (if any) individuals are likely to have alleles for resistance to the disease.
Give two characteristics that domesticated animals are selectively bred for.: Any two of: a higher milk yield (dairy cows), more meat (beef cattle), a calm, gentle temperament (e.g. pet dogs), better wool (sheep).