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Biology

GCSE · Edexcel

QuestionsFlashcards

Photosynthesis
Plant Structure
Transport in Plants
Plant Hormones
- Plant Hormones & Growth
  7
- Using Plant Hormones Commercially
  7

Transport in Animals
- The Need for Transport
  7
- Factors Affecting the Rate of Diffusion
  7
Respiration
- Respiration
  6
- Practical: Investigating Respiration
  5
Gas Exchange
Circulatory System
- The Blood & Blood Vessels
  6
- The Circulatory System
  8

Mutations Flashcards

All 5 cards in this deck

What is a mutation?: A random change in the base sequence of DNA, which can produce a new allele of a gene.
How does genetic variation within a population of a species arise?: Through mutations, which produce new alleles; these are then spread and combined by sexual reproduction.
What are the three possible effects a mutation can have on the phenotype?: Most have no effect; some have a small effect; rarely, a single mutation significantly affects the phenotype.
True or false? Most mutations change an organism's phenotype.: False. Most mutations have no effect on the phenotype at all.
True or false? There is usually extensive genetic variation within a population of a species.: True. Mutations over time produce many different alleles within the population.