b)+Inheritance+-+(evolution)

Section 3- Reproduction and inheritance a) Reproduction (plants) - a) Reproduction - (humans) - b) Inheritance (chromosomes, genes and DNA) - b) Inheritance - (mono-hybrid crosses and sex determination) - b) Inheritance - (cell division and variation) - b) Inheritance - (evolution)

b) Inheritance - (evolution)
Giraffes used to have short necks. In groups draw a short cartoon strip to explain to the class why they now have long necks. //(this is just for explaining ideas about evolution - in reality the reason Giraffes evolved long legs and necks is unclear)//
 * Starter**

[remember 3.29 understand that mutation is a rare, random change in genetic material that can be inherited and 3.33 understand that the incidence of mutations can be increased by exposure to ionising radiation (for example gamma rays, X-rays and ultraviolet rays) and some chemical mutagens (for example chemicals in tobacco).] 3.30 describe the process of evolution by means of natural selection 3.31 understand that many mutations are harmful but some are neutral and a few are beneficial 3.32 understand that resistance to antibiotics can increase in bacterial populations, and appreciate how such an increase can lead to infections being difficult to control
 * Learning outcomes (s//tudents will be assessed on their ability to)//**

Review the learning outcomes about mutations.
 * Approach**

Take notes against each green evolution learning outcomes as directed by your teacher.

Now try the summary questions to see how well you understand the evolution and natural selection. media type="custom" key="27835963"

//** Green book reference: p208-217 **//
 * Resources**

Learn more about natural selection using peppered moths as an example media type="file" key="pepperMoths.swf" width="640" height="480"

Khan Academy's tutorial on evolution and natural selection media type="custom" key="27835967"

You need to learn about the bacterial resistance to antibiotics this PBS video explains what happens and the consequences of antibiotic resistance.

[|Tutorial from McGraw and Hill] - includes insecticide resistance example

These video tutorials from [|Click4Biology]address each learning outcome. It's recommended that you use them both as part of your learning and your revision. Download links are provided for those who have trouble accessing Youtube. //N.B. The numbering of some of the videos is out due to Edexel syllabus changes.//

3.29 mutations [|download] media type="custom" key="27835969" 3.30 the process of evolution by means of natural selection [|download] media type="custom" key="27835971" 3.31 mutations can be harmful, neutral or beneficial [|download] media type="custom" key="27835973" 3.32 bacterial resistance to antibiotics [|download] media type="custom" key="27835977" 3.33 causes of mutations [|download] media type="custom" key="27835979"

Scishow's crash course on "Evolution: it's a thing (not a debate)" is a good video and sets a context for how we know what we know about evolution and the origin of life on Earth. It does though go beyond IGCSE and should be treated as an extension activity. media type="custom" key="27835981"
 * Useful Extras**