Year 11 Triple Global Warming Lesson

Year 11 Triple Global Warming Lesson

11X/Tr

Do now

• Explain how two parents who do not have Cystic Fibrosis can have a child with the genetic disorder. (3 marks)

• Explain how genetic engineering can be used to produce human growth hormone. (5 marks)

• Explain how a peacock has evolved to have bright colourful flowers. (5 marks)

Answer to question 1

• Cystic fibrosis is a recessive condition.

• Both parents pass on a recessive allele for the genetic disorder to the child.

• Child is homozygous, has two copies of the recessive allele.

Answer to question 2

• Cut out the gene for human growth hormone from DNA using a restriction enzyme.

• Cut open the bacterial plasmid, using the same enzyme.

• Insert the human gene for growth hormone into the bacterial plasmid, using an enzyme (ligase).

• Place plamid into bacterial cell, divides by mitosis, clones all containing human gene for growth hormone.

Answer to question 3

• Some peacocks have colourful feathers, there was variation in the peacock species.

• Peacocks with colourful feathers attract more mates (advantageous characteristic).

• Peacocks with colourful feathers survive and reproduce more.

• Pass on allele for colourful feathers to their offspring.

• Repeated over many generations.

Greenhouse effect

• Greenhouse gases: CO₂, CH_4, water vapour

• Maintains warm and stable temperature on Earth.

• Greenhouse gases trap IR radiation.

• Traps heat.

• Increases the temperature of the Earth's surface.

Watch this video clip (approx.6mins) https://www.youtube.com/watch?v=Z_b2A-d5hGY&safe=active

Global Warming

Increase in the temperature of the surface of the Earth.

Consequences of global warming

• Climate change

• Extreme weather patterns

• Natural disasters e.g. hurricanes

• Rising sea levels

• Extinction

• Loss of habitats

Human Influences

• Burning fossil fuels

• Population increase, demand on resources

• Waste production

• Rearing cows/meat

• Rice paddy fields

• Deforestation

• Removal of peat bogs

What makes drawing conclusions difficult?

• Cause and effect e.g. MMR vaccine causing Autism, just because a child with Autism had the MMR vaccine does not mean that one caused the other.

• Modelling climate change and weather patterns is very difficult.

• Different methods for measuring variables such as temp and CO₂.

Open Ended

Define the term global warming. (1 mark)

Open Ended

Extension: why is global warming a 'controversial' topic? (6 marks)

Open Ended

Why is the greenhouse effect required for life on Earth? (1 mark)

Open Ended

Define carbon sink. (2 marks)

Open Ended

Define green house gas. (2 marks)

Open Ended

Describe the consequences of global warming. (4 marks)

Open Ended

Describe human influences on global warming. (3 marks)

Open Ended

Describe the greenhouse effect. (4 marks)