Posts Tagged ‘Natural selection’


Thursday, January 20th, 2011

Evolution street sign by Colin Purrington on flickr

Evolution is the cumulative change in the heritable characteristics of a population.

This is a key unit in Biology.  We will explore the evidence for evolution provided by the fossil record, selective breeding of domesticated animals and homologous structures.  We will understand that populations tend to produce more offspring than the environment can support and how this can lead to a struggle for survival.  We’ll learn that members of a species show variation and how sexual reproduction promotes this variation.  We will address natural selection and how it leads to evolution.  And we’ll finish up by learning some examples of evolution in response to environmental changes, such as antibiotic resistance and changes in the colour of peppered moths.   This is a great slideshow on the development of antibiotic resistance.

Sound fun? It is!  Here is the link to a great presentation on this topic.  This one from Mr Hobbins is great too. 5.4 Evolution