GLY 135 Evolution Part 2 - GLY135 19:09 DNA/RNA...

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GLY 135 19:09 Third Meaning of Evolution Mechanism for descent with modification DNA/RNA Structure of DNA (Double helix – 2 chains of nucleotides) (Adenine, thymine)- pair (cytosine, guanine)- pair DNA makes RNA- single chain, different sugar, Uracil instead of thymine DNA provides template for RNA Order of nucleotides in RNA determines order in which amino acids come together to  make proteins Variation introduced by 2 sources Mutation= change in nucleotide sequence of DNA (error made when DNA being copied) Some mutations have severe consequences, others make little or no changes to the  amino acid sequence Changes can be long when they affect regulatory genes
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Unformatted text preview: Random with respect to future usefulness Recombination- variation in organisms that reproduce sexually (each offspring receives ½ of each parent’s genes) How DNA controls development Mutations Recombination Natural Selection- based on observations Variation is inherited (DNA/RNA) Natural Selection Favors: Ability to acquire and use resources Resistance to predators, disease, environmental change Reproductive abilities When environment changes, natural selection works with variations already present- new combination adapted to new environment 19:09 19:09...
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  • Spring '14
  • PatriciaKelley
  • DNA repair, amino acid sequence, uracil, 2 chains, RNA­ single chain

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