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Combined Science: Biology

GCSE · Edexcel · higher

QuestionsFlashcards

Disease
Defence Against Disease
Development of Medicines
- Antibiotics
  4
- Discovery & Development of New Drugs
  6
Non-Communicable Diseases
- Lifestyle & Non-Communicable Disease
  8
- Cardiovascular Disease
  6

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

Mutations Flashcards

All 4 cards in this deck

What is a mutation?: A change in the sequence of DNA bases.
How does a mutation lead to genetic variation within a population?: It changes the DNA base sequence, producing a different allele of the gene, which can affect the phenotype.
What are the three possible effects of a mutation on the phenotype?: Most have no effect; some have a small effect; rarely, a single mutation significantly affects the phenotype.
True or false? An insertion, deletion or substitution of DNA bases all count as mutations.: True. Each changes the sequence of DNA bases.