DNA from fruit
I can observe DNA extracted from fruit and identify the main apparatus and steps in the extraction method.
DNA from fruit
I can observe DNA extracted from fruit and identify the main apparatus and steps in the extraction method.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- DNA is a chemical substance that can be extracted from the cells of organisms such as fruit.
- DNA molecules cannot usually be seen with the unaided eye, but clumps of it can be seen when a lot of it is extracted.
- Observing or following an appropriate method to extract DNA from fruit (e.g. kiwi fruit).
- Discussion of apparatus and techniques used to filter the tissue and extract the DNA.
- Observing and describing the appearance of the DNA after extraction.
Keywords
Cell - A cell is the smallest living building block of an organism, and it contains genetic material that provides the instructions used to build and control the organism.
DNA - Genetic material is made of a chemical substance called DNA, in which the instructions are stored using the genetic code.
Mortar and pestle - A mortar and pestle are used to crush and grind up solid samples.
Filter - To filter a mixture is to separate out insoluble particles from a liquid. It can be done using a funnel and filter paper.
Pipette - A pipette is used to transfer small quantities of liquid.
Common misconception
DNA is just 'genetic information' and not a substance; not all organisms contain DNA (e.g. plants).
The lesson demonstrates that DNA is a physical, chemical substance that can be extracted from cells, and shows that plants contain DNA.
To help you plan your year 7 science lesson on: DNA from fruit, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 7 science lesson on: DNA from fruit, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 3 science lessons from the Heredity and DNA unit, dive into the full secondary science curriculum, or learn more about lesson planning.
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
Lesson video
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Starter quiz
6 Questions
Exit quiz
6 Questions
releases cells from the tissue
removes large pieces such as seeds
to add a small amount of salt
unwinds the DNA
breaks down cell membranes
DNA floats in it and forms clumps