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**Standard Grade Biology**

Inheritance Topic What is Variation?

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**Inheritance By the end of this lesson you should be able to:**

Describe what variation is. Give examples of 2 types of variation in your class Know how to present data to show the 2 types of variation

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What is variation? There are many differences between the pupils in your class. List the ones that you can SEE.

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What is variation? Collect a “Variation Data for our class” sheet to record your data. Working in pairs record the following information for each of you: Middle finger length in cm Tongue roller Ear lobes Hand clasp Height in cm Eye colour

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**Discontinuous variation**

Some of your data falls into one or more clear cut groups. Which ones? This variation is called DISCONTINUOUS variation. Write 3 examples into your jotter.

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**Discontinuous variation**

We use a bar chart to show discontinuous variation. Draw a bar chart to show either tongue rollers or eye colour.

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**Continuous variation? Some of your data had to be measured.**

Which ones? This variation is called CONTINUOUS variation. Write 3 examples into your jotter.

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**Continuous variation We use a histogram to show continuous variation.**

Draw a histogram to show either height or finger length.

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**What is Variation? of the same show many These differences are called**

individuals of the same show many These differences are called species differences variations species differences individuals variations

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Types of variation? Draw a table dividing the following list into continuous and discontinuous variations: Blood groups ear lobes Height body mass Pulse rate eye colour Gender shoe size Tongue rolling hand span

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**Types of variation? Complete the “Variation Flow Chart” Use the**

following word bank. Measured Wide range Discontinuous Observed Clear cut Continuous

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**Inheritance By the end of this lesson you should be able to:**

Describe what variation is. Give examples of 2 types of variation in your class Know how to present data to show the 2 types of variation

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