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Summary Ch 9 Genetic diversity and adaptation notes A* AQA A Level Biology £4.49   Add to cart
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  7. Unit 4 - Genetic information, variation and relationships between organisms

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Summary Ch 9 Genetic diversity and adaptation notes A* AQA A Level Biology
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A set of thorough and concise notes created and used by an A* grade student to revise Genetic Diversity and Adaptation (ch 9 from the A Level AQA Biology course). The notes are detailed and clearly explain the topic by breaking each process down into steps. It includes clear and detailed diagrams a...

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  • Ch 9 genetic diversity and adaptation
  • May 28, 2022
  • 29
  • 2020/2021
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9.1 Gene mutation

,What are mutations?
• Changes to the quantity or sequence of bases in DNA
• Can be just one nucleotide
• May be inherited or happen during cell division

• How do mutations affect proteins?
• DNA change  may change amino acid sequence  change in bonding
new tertiary structure  may no longer function

, Substitution of bases
• A nucleotide is replaced by another nucleotide
with a different base
• This may affect which amino acid it codes for
• Only one amino acid is affected in most cases
• If this amino acid was important in bonding then it
might affect the tertiary structure
• No effect: if the new codon codes for the same
amino acid
• If the new codon is a stop codon, then the rest of
the polypeptide wont be produced

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