At the end of this lesson you should be able to 1. Discuss the diversity of organisms 2. Define the term species 3. Distinguish between inherited and acquired variation 4. Give examples of inherited and acquired variations

Variation means that there are differences between members of the same species i.e. a population Think of all the variations within your class even though you are all human

A group of organisms capable of interbreeding and producing fertile offspring. Humans Cats Dogs Oak Trees Ash Trees

Males are sterile but female are fertile – so not a new species

What is meant by variation? Give the definition for species Why is a liger not a new species?

1. Inherited Variations 2. Acquired Variations

These are variations you get from genes inherited from your parents They can be passed on to the next generation Hair Colour Eye Colour Face shape Tallness You inherit different traits from each parent

These are not inherited. You are not born with these types of variations. These are learned or picked up through your lifetime. These variations are the influence of your environment They are not passed on to the next generation Examples: Which language do you speak? Which sport do you play?

We all have the same the inherited characteristics. but We all have different versions of the same characteristics called traits. CharacteristicTraits Hair ColourRed, Blond, Black

1. What are the two types of inheritance? 2. Your hair colour is black - is this an example of acquired or inherited variation? 3. You can play the piano - is this an example of acquired or inherited variation?

Can you ………. 1. Discuss the diversity of organisms 2. Define the term species 3. Distinguish between inherited and acquired variation 4. Give examples of inherited and acquired variations