THis video relates to the selective breeding and cloning sections that we will look at in the next few lessons. Watch it and write down any questions you have to bring into class.

Genetics

Today we'll be working on the last section of the Biology course - Genetics.  Answer the following questions in your books -

1. Define sexual and asexual reproduction - http://www.biotopics.co.uk/genes1/asexual_and_sexual_reproduction.html
2. Using the link from question 1, what type of reproduction leads to variation in a population?
3. What does DNA in genes code for? - http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/geneticvariation/whyorganismsaredifferentrev1.shtml
4. Place the following in order from smallest to largest - Nucelus, DNA, chromosome, gene.
5. Apart from genetics, what else can influence how an organism looks? - http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/geneticvariation/whyorganismsaredifferentrev3.shtml
6. Briefly describe what cloning is and outline one way that it can occur - http://learn.genetics.utah.edu/content/tech/cloning/whatiscloning/
7. Play this game, what things are randomly separated to determine what the offspring will look like? - http://www.sciencemuseum.org.uk/whoami/thingdom.aspx

Try any of these once you're finished - http://nature.ca/genome/04/041/041_e.cfm

This video is really relevant to the section of the course that we're looking at now.  We won't have time to watch it all in class, but it would be a good use of time to see it all at home. Some bits are a little bit graphic, but it's all worth it!

Revision

For revision before the test coming up (Wednesday for 10x2, next week for 10y4), make sure you're comfortable with the following points:

• What animals and plants compete for (what resources in which conditions).
• How plants and animals are adapted to compete for them ('tricks' they have which help them survive.  Make sure you know how plants are adapted to dry environments and how an animal's body size affects it's heat loss).
• What biomass means, and why it is important for ecosystems.
• What happens at each step in a biomass pyramid, why energy is constantly being lost and how it gets passed on.
• How changes in the environment can affect species living there, and why variation in a species is important.

To help you at home, try using the textbook on kerboodle, or GCSE bitesize - http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/interdependence/ , http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/energy_biomass/

Energy flow in Ecosystems

1. Give the equation for respiration (both the words AND symbols) - http://purchon.com/biology/aerobic.htm
2. Explain the difference between a pyramid of numbers and one of biomass - http://www.bbc.co.uk/schools/gcsebitesize/science/edexcel_pre_2011/environment/populationsandpyramidsrev2.shtml
3. Give two ways that energy can be lost from a food chain - http://www.bbc.co.uk/schools/gcsebitesize/science/edexcel_pre_2011/environment/populationsandpyramidsrev3.shtml
4. In general, why do cold-blooded animals require less energy than warm-blooded ones? - http://coolcosmos.ipac.caltech.edu/image_galleries/ir_zoo/coldwarm.html
5. At which steps in a food chain is energy lost?
6. Complete this activity, making sure you write down what percentage of energy makes it to the next stage at each step - http://www.teachersdomain.org/asset/tdc02_int_energyflow/
7. Try any of the links here - http://reviewgamezone.com/game.php?id=3030

Term 2

Welcome back! Today we will be looking at some competition stuff from last term, and starting on a new topic - energy.

1. Briefly describe two types of factors that could cause enivronmental change - http://library.thinkquest.org/CR0210243/Science%20Station/How%20living%20things%20interact%20with%20their%20environment/relationship%20of%20biotic%20and%20abiotic%20factors.htm
2. What do populations (not individuals) need to help them survive? - http://evolution.berkeley.edu/evolibrary/news/101201_panthers
3. How can climate change affect the distribution of organisms? Use one example from this site - http://www.nhm.ac.uk/nature-online/environmental-change/measuring-climate-change/species-distribution/index.html
4. What does biomass mean? (Remember that we're not talking about renewable fuels, just ecosystems) - http://www.answers.com/topic/biomass 
5. What level in a biomass pyramid is usually the biggest? - http://cleangreenenergyzone.com/pyramid-of-biomass/
6. Draw a biomass pyramid for the grass - vole - barnowl food chain - http://www.bbc.co.uk/schools/gcsebitesize/science/edexcel_pre_2011/environment/populationsandpyramidsrev2.shtml
7. Try these once youre done -  http://science.discovery.com/interactives/literacy/darwin/darwin.html , http://teacher.scholastic.com/activities/explorer/ecosystems/be_an_explorer/map/form.htm#