At the end of this lesson you should be able to
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
1.
 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.
Characteristic
Hair Colour
Traits
Red, 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 ……….
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
1.