• Revision:Gcse biology - evolution and selective breeding  TSR
Wiki > Study Help > Subjects and Revision > Revision Notes >
Biology > GCSE Biology - Evolution and Selective Breeding
Evolution is the development of new species from existing ones,
and this evolution is driven by natural selection which acts on
the variations within a population. A species is; a group of
individuals of the same type who are able to breed together and
have fertile offspring  Darwin’s theory went against the church
when it was published, but now it is a cornerstone of biology
and genetics. He noted four important facts    • All organisms
produce more offspring that can survive   • However, population
numbers remain constant   • Organisms within a species show a
wide variety of characteristics due to genes   • Some of these
characteristics are passed on to the next generation  Ideas
which support his theory are    • Similar animals exists on
different continents (distribution)   • Homologous structures
exist in animals, like sk