Posts Tagged ‘survival’


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


Tuesday, February 2nd, 2010

Here are some questions we need to answer:

  1. What is the difference between innate and learned behaviour?  How can the process of learning improve the chance of survival?  Give examples.
  2. What is the difference between taxis and kinesis?  Give examples of each.  How could these be investigated in the lab?
  3. What experiments did Pavlov carry out on dogs?  What is the difference between unconditioned and conditioned stimuli?  What is the difference between unconditioned and conditioned response?
  4. What role do genetics and learning play in the development of birdsong in young birds?

This presentation from Mr Taylor in Bandung is excellent, as is click4biology.

And we’ll finish this section by doing a design lab – you need to design an experiment to investigate innate behaviour by either taxis or kinesis.  This will just be a design exercise – we won’t actually carry out the lab. Here are the criteria: Design lab criteria