B2.3.6 - Natural Selection Flashcards
What provides us with the most evidence for evolution?
Fossils
Who came up with the idea of natural selection?
Charles Darwin
What is evolution?
When organisms change over time
The first living organisms on Earth were…
Unicellular (one cell) organisms e.g. bacteria
What do we call the process that explains how organisms evolve over time?
Natural Selection
Recall the words that you must include in a 6 mark questions asking you to explain natural selection.
Random Mutation - red monkeys
Variation - violently
Advantage - attack
Survive - smelly
Reproduce - red
Genes (pass on) - gorillas
How long ago did life start on Earth?
Approximately 3 billion years ago
What is the main evidence for the existance of dinosaurs?
Fossils
Before the industrial revolution, peppered moths were mostly pale coloured. Why did more dark peppered moths appear in Britain during the industrial revolution?
Because soot form factories turned trees black.
Dark coloured moths were better adapted as they could camouflage.
Dark moths were not eaten, pale moths were eaten.
Genes for dark colour were passed onto the next generation.
Who came up with an alternative (incorrect) theory of how evolution happens?
Jean Baptiste Lamarck
What was Jean Baptiste Lamarck’s explanation for the process of evolution.
Features change the more they are used.
These changes are passed on to offspring.
Why is it difficult ot know for certain that birds evolved form dinosaurs?
There could be missing fossils that show they are not related.
Feathers are not usually preserved so dinosaur fossils might have actually been birds.
