Starter quiz
In the image, which earlobes are attached?- top left
- top right ✓
- bottom left ✓
- bottom right
-
- Which tally is correct for six items?
Which type of graph is this?- line graph ✓
- bar chart
- histogram
- pie chart
-
- On which axis of a graph should you plot the independent variable?
- x-axis ✓
- y-axis
- no axis
-
- On which axis of a graph should you plot the dependent variable?
- x-axis
- y-axis ✓
- no axis
-
- Why is it often valuable to plot data as a graph?
- Because it looks smart and presentable.
- It’s a different way of showing the data.
- It tends to show trends and patterns more clearly. ✓
- A table tends to show trends and patterns clearly.
-
Exit quiz
- Blood type and earlobe attachment are examples of ______ variation.
- 'discontinuous' ✓
Which type of graph is this?- line graph
- histogram
- bar chart ✓
- pie chart
-
- How should a bar chart be plotted?
- the bars should not touch each other ✓
- the bars should touch each other
- bars of different widths
- bars of equal widths ✓
-
- Which of these factors causes discontinuous variation between organisms?
- genetics ✓
- environment
- lifestyle
-
- Which statements about the bar chart are true?
- it shows continuous data
- it shows discontinuous data ✓
- it shows categoric data ✓
- it shows measurements of discontinuous variation ✓
- categories are shown on the y-axis
-
- Eye colour is genetic, but there many variations of colours. How many genes must control this feature?
- none
- one
- several ✓
-
Worksheet
Loading worksheet ...
Presentation
Loading presentation ...
Video
Lesson Details
Key learning points
- Using a bar chart to display discontinuous data.
- Plotting data for discontinuous variation on a bar chart.
- Interpreting and describing a bar chart displaying data for discontinuous variation.
- Discontinuous variation usually has only a genetic cause and is not affected by environment or lifestyle.
Common misconception
Using a line graph or histogram to plot discontinuous data. All features show variation due to environmental and lifestyle factors.
The lesson explores why a bar chart is the correct choice for plotting discontinuous data, and the idea that discontinuous variation usually has only a genetic cause.
Keywords
Discontinuous variation - Variation which is categorical (divided into particular categories).
Bar chart - A graph displaying categorical data plotted as columns of equal width that do not touch. The height of each column represents the tally or frequency for the category (how many times it was observed).
Genetics - Related to the genetic material (DNA) and genes that an individual has.
+