Biology AS AQA Unit 2 Adaption and Selection

Made these notes for my year 12 summer exam to revise and read over. There are spelling mistakes in most of my files but due to the busy exam schedule I had no time to correct them (sorry).

Most files have more information than what is needed but I feel it helps you feel more confident walking into the exam if you have a greater knowledge background and may help when having to apply knowledge to questions. Good luck :)

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  • Created by: Chelcie
  • Created on: 02-09-13 12:41

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Adaptation and Selection
Organisms adjusting to suit their environment.

Arises from changes in the DNA from genetic recombination and mutation.

Changes in DNA that result in different characteristics.
A difference in the base sequence may result in a different sequence of amino acids being coded

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2 different strains of ecoli in growth medium.
Each strain is unable to synthesize nutrients needed for growth.
STRAIN 1 ­ needed amino acid methionine, vitamin biotin.
STRAIN 2 ­ amino acid theromine and leucine needed.
They mixed the two strains of ecoli together with all the nutrients.
Bacteria was…


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