sadii_
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#1
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what was Darwin theory i need to knw for my gcse exam biology on friday plz help
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Parallex
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Darwin theorized that organisms descended from a common ancestor. GCSE is very brief on evolution anyway to be honest. Just read the simple facts off Google and why some evidence (e.g. the pentadactyl limb) supports his theory.
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Natural selection. Mutations causes genetic variation due to different species having different alleles. The best adapted species survived whereas the less adapted died out, causing the better adapted species to have less competition and breed successfully so the species is said to have evolved.

The other theory you should be expected to know at GCSE is Lamarck's theory, which states that characteristics were passed from parents to offspring, which is not true.
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sadii_
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thanks soooooo much
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sadii_
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thanks

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sadii_
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so i dont need to learn Darwin theory that much but Lamarck more
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(Original post by sadii_)
so i dont need to learn Darwin theory that much but Lamarck more
Pretty much all you need to know is in my post above.

The only information required about Lamarck's theory is what I posted and that it's wrong. Natural selection is much more important.
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sadii_
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okay kool thnxs
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lerjj
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https://www.youtube.com/watch?v=S1t5...W7hkUMVaZz4eDg

Darwin: variation, selection pressure, certain species don't progress, better adapted species continue.

Lamarck: Giraffe stretches to eat leaves, has a taller child.

Ultimately, the first explanation is better, (also, video is good for explaining the difference between evolution and natural selection so you can be petty and pedantic in your B1 exam!)
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