Genetics is an important part of all A Level biology specifications, both at AS and A2. This is an introduction to the subject, looking at how characteristics are passed on from one generation to another and the processes that lead to variation within a species. The molecular structure of chromosomes and genes is explained to show how the information is coded and expressed within the cell and why it can go wrong. The text then explains how variation within populations is measured and shows how it can be influenced by human activity and natural selection, leading to new species. The final chapters look at the impact of genetic engineering and the applications of genetic technology to humans.

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