Darwin's Observations (OCR A-Level Biology A): Flashcards
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Practise the cards
10 cards from this deck
Convergent evolution
Convergent evolution
Independent development of similar traits in unrelated species
Darwin's 1st observation
Darwin's 1st observation
Organisms produce far more offspring than survive to adulthood
Darwin's 2nd observation
Darwin's 2nd observation
Population numbers remain relatively constant over time
Intraspecific variation
Intraspecific variation
Variation in characteristics within a population
3 causes of intraspecific variation
3 causes of intraspecific variation
Crossing over, independent assortment, random gamete fusion
Natural selection
Natural selection
Environmental factors favour best-adapted individuals to survive
Fitness in biology
Fitness in biology
Ability to survive to adulthood and reproduce successfully
Darwin's 'struggle for life'
Darwin's 'struggle for life'
Competition for limited resources among organisms
Beach mice key adaptation
Beach mice key adaptation
Lighter fur for camouflage against light-coloured sand
Why beach mice same species as oldfield mice
Why beach mice same species as oldfield mice
Can interbreed to produce fertile offspring