Variation and evolution (AQA GCSE Biology): Flashcards
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What is evolution?
What is evolution?
Inherited features of a population change over time
Cause of evolution
Cause of evolution
Natural selection
Variation definition
Variation definition
Differences between individuals in a population
3 main causes of variation
3 main causes of variation
Genetic, environmental, combination of both
Genetic variation examples
Genetic variation examples
Eye colour, blood type, natural hair colour
Environmental variation examples
Environmental variation examples
Scars, language, muscle development from exercise
Most variation caused by
Most variation caused by
Genes & environment working together
Source of all genetic variation
Source of all genetic variation
Mutations (changes in DNA)
Natural selection outcome
Natural selection outcome
Well-adapted individuals survive & reproduce more
When do populations become separate species?
When do populations become separate species?
When they can't breed together to produce fertile offspring
Effect of most mutations on phenotype
Effect of most mutations on phenotype
No effect
Uganda elephants tuskless: 1930 vs 2010
Uganda elephants tuskless: 1930 vs 2010
1930: 1%, 2010: 15% female & 9% male