Edexcel Biology (B1) Revision Notes

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Classification, Variation and Inheritance

  • Living things are put into groups according to how closely they are related to one another. The Kingdom is the largest group and species the smallest. Each species is given a two-part (binomal) name.
  • Living things have characteristics that enable them to live in their environment. This is called adaptation .
  • Members of species show differences called variation, which can be due to genetics or the environment, and which can be continuous or discontinuous.
  • Darwin's theory of natural selection explains how living things evolved due to variation and survival of the best-adapted.
  • Alternative forms of genes called alleles are passed from parents to offspring. A dominant allele masks the presence of a recessive allele.
  • Disorders such as sickle cell disease and cystic fibrosis are inherited. Gentic diagrams help us to analyse who in a family is at risk of having the disorder or being a carrier of the affected allele.


 Responses to a Changing Environment

  • The amount of water and glucose in the body and body temperature and kept constant



Thanks! It sorta helped..


Thanks!! Easy to understand!!


Is this the whole of B1?


they *** ****** us i registered for no reason :/ 


Nice! Hope this helps me get an A in 2017.

Matthew Newall

Is this all of B1


Is this b1 seriously?


Doesn't show the whole of B1 this is more like a quarter of B1 topic 1

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