Variation Learning objectives Describe how variation in a

Variation Learning objectives: • • Describe how variation in a species occu. rs Describe the differences between environmental and inherited variation Starter: Describe some of the ways in which humans vary from one another.

Similarities and differences are used to sort organisms into groups. Differences between organisms are known as variation.

There is less variation between organisms of the same type. What are organisms of the same type said to belong to? The same SPECIES

Task: Note down ways in which these people vary and think about the reasons why

Inherited variation Inherited characteristics include: Lobed/Lobeless ear Hair Colour Eye colour

Environmental variation Environmental Characteristics include: Piercings Weight Strength

Inherited variation Which features have you inherited from your parents? 1. Discuss with you partner which features you think you have inherited from your parents 2. Illustrate these ideas by drawing a spider diagram in your book Me and my mum have the same colour hair Inherited Features Extra Challenge: Write down your thoughts about why we are not identical to our parents I have the same colour eyes as my dad Me and my mum have the same shaped nose

Inherited variation We are not identical to one parent because we inherit a mix of features from both our parents. This is called inherited variation.

Environmental variation • Environmental factors cause an organism to change, this is environmental variation Weak Lion Strong Lion Where you grow up

Environmental variation • Draw the table below in your books Environmental Factor Environmental Variation • Identify which environmental variation E. g. factors causes which Environmental factor Environmental variation Where you grow up Which football team you support

E. g. Amount of sunshine Weight of an organism Environmental factor Environmental variation Where you grow up Which football team you support Food available Language you speak Height of a plant Country you grow up in Extension: Write some examples of environmental variation within the class

Self-assessment: Environmental Factor Country you grow up in Environmental Variation Language you speak Amount of sunshine Height of a plant Food available Weight of an organism

Environmental or Inherited? Task: Compare the examples of variation – decide whether they are examples of inherited or environmental variation, or they could be both! In pairs arrange the cards under the correct headings on the poster – place the ones that could be both in the middle Inherited Variation Environmental Variation

Self-assessment: Inherited Variation Environmental Variation 7. 9. 8. 13. 14. 15. 1. 3. 5. 2. 4. 6. 10. 12. 11 16.

Inherited & Environmental Variation Imagine a world where there was no variation, a world where everybody looked exactly the same as one another!! Task: Describe the advantages and disadvantages of this world, think about the personalities, jobs and hobbies people might have and whether you would like to live in a world like this! Key Words: Inherited Environmental Characteristics Species Factors Variation

Plenary ~ Take a minute! Spend a minute talking to the person next to you about what you have learnt today!

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