Darwin: The Theory of Evolution by Natural Selection (Grade 12 NSC Matric Life Sciences): Flashcards
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Scientist who developed theory of evolution by natural selection
Scientist who developed theory of evolution by natural selection
Charles Darwin
Ship Darwin travelled on for observations
Ship Darwin travelled on for observations
HMS Beagle
Darwin's observation: offspring produced vs. needed for survival
Darwin's observation: offspring produced vs. needed for survival
Far more offspring produced than needed
Natural selection definition
Natural selection definition
Organisms best suited to environment produce most offspring
Meaning of 'survival of the fittest'
Meaning of 'survival of the fittest'
Best adapted to environment, not strongest
Factors creating selective pressure (give examples)
Factors creating selective pressure (give examples)
Food, competition, predation, climate, shelter
First step in natural selection process
First step in natural selection process
Variation exists amongst offspring
Guppy spot count in streams with many predators
Guppy spot count in streams with many predators
Fewer spots
Natural selection: creates new traits or acts on existing variation?
Natural selection: creates new traits or acts on existing variation?
Acts on existing variation
Time required for natural selection to work
Time required for natural selection to work
Many generations