Posts Tagged ‘variation’

Evolution

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

Warning – test ahead!

Wednesday, October 20th, 2010

no lifeguard on duty by Zoramite on flickr (modified)

Grade 10s  – you have a test coming on Genetics and Variation.  B block will take it on November 4th, E block on November 5th. 

Take a look at this revision checklist.  It will help prepare you for your test after the break.  Good luck!

Grade 10 REVISION checklist for Variation and Genetics

Variation

Wednesday, September 29th, 2010

Tallest man vs Shortest man by kire on flickr

  • What is variation?
  • Why is it beneficial for organisms in the same species to show variation?
  • What is the difference between continuous and discontinuous variation?

These are a few of the questions we’ll be answering in this next section of work.  You are going to collect data, and lots of it, to compare one continuous and one discontinuous type of variation.  Choose your variables carefully, design suitable results tables, collect as much data as you can – the more the better – and then collate it, and draw graphs of your results.  Choose an appropriate type of graph for each variable.  Here is the detailed outline for you to use Continuous and Discontinuous Variation

Use this rubric to check your work before submitting it. FINALRubric DCP