1. Variation for survival

2. Variation for Survival
Starter:
1) Write down some variations that you can find in dogs?
(Fur colour etc.)
2) List as many different breeds of dog that you can think of.

3. Variation for Survival
L/O
ALL: Explain the importance of biodiversity and present the key points.
Most: Explain the difference between continuous and discontinuous variation.
Some: Evaluate the importance of variation in organisms.

4. Biodiversity is important
We can see from the classification system that there are too many living things to imagine!
Even within a species such as humans or dogs there is diversity and variation.
Biodiversity measures the amount of different species.
Maintaining biodiversity is an important part of using the environment in a sustainable way.
Copy!

5. Biodiversity
Can you think of any habitats on Earth that might have a lot of Biodiversity?
The rainforest and coral reef are home to thousands of different species

6. Biodiversity video Question: Why is biodiversity important?
Do humans have a responsibility to protect biodiversity?

7. Task Key words – find definitions
Species -
Variation -
Biodiversity -
Ecosystems -
Classification -

8. There are 2 types of variation
Continuous variation & Discontinuous variation

9. Continuous variation

10. Continuous Variation
Differences in one feature that can change gradually and have a range of values e.g. human height changes as children grow
Continuous variation is either caused by environmental factors, Or
Lots of different genes all working together,
A combination of both

11. Discontinuous variation

12. Discontinuous variation
Differences in one feature that only have a few options e.g. eye colour.
Discontinuous variation forms categories
Usually caused by one or two inherited genes
You either have the gene or you don’t,

13. Graphs and Charts Discontinuous variation.
Blood types have set categories.
Continuous variation.
Height can be along a scale with lots of different values.

14. Continuous and discontinuous variation
Continuous variation is a feature that can change gradually, such as height. It has a range of values. Both environmental factors and genes affect continuous variation.
Discontinuous variation forms categories, such as eye colour. It is caused by your genes. You cannot change you eye colour.

15. Draw table in books Continuous Variation Discontinuous Variation
Walk around the room and spot the variations. Put them into the correct groups.

16. Measuring Continuous Variation
Height is an example of continuous data, you can measure 160 cm, cm, or 161 cm
There are not set categories just a range of answers.
You can draw the heights of people on a graph to show continuous variation

17. Look at the measurements
132 cm, 133.2cm, 135.6cm, 137cm, 137.4cm
140.5 cm, 142.9cm, 143 cm, 144cm, cm, 146cm, 148.1cm
150 cm, 151.5cm, 153 cm, cm, cm, cm, 154.6cm
155.6cm, 155.7cm, 156.8cm, 157cm, 159cm
160cm, 162cm, 164.3cm, 165cm, 167.9cm
170cm, 172cm
What is the largest? -
What is the smallest? –
What is the range? –

18. Tally Table II III IIII I
Continuous data can look messy so we have sorted it into categories based on height,
Height cm
Number of pupils II
III
IIII I

19. Draw a frequency graph
X axis – height in ‘discontinuous’ categories (cm)
Y axis – number of pupils (make sure you use a suitable scale)

20. Draw your graph II III IIII I Height cm 130-134 135-139 140-144
Number of pupils II
III
IIII I

21. Why is variation important?
Variation is important because it produces different gene combinations which result in the new offspring to become more immune to other diseases.
Variation for humans is important in order to make the ever evolving healthy human.
Variation occurs in all living things. Even the pathogens such as the flu virus change and adapt so we keep having to make new flu vaccines each winter.

22. Questions What is biodiversity?
Can you explain of a hybrid and think of an example?
Can you see variation within a species such as humans or dogs?
Give an example of continuous variation.
Give an example of discontinuous variation.

23. Plenary 1) List three features of the organisms that show variation.
2) For each feature you have identified in part c), identify whether you would measure or count it.