Last year we did a first investigation into genetics and heredity, by demonstrating how play dough monsters offspring would look.
We moved on to look at cell structure and then DNA extraction from an onion.
we had a look at the onion cells under the microscope.
Then we coated the onion in washing-up liquid and added half a teaspoon of salt. This helps to break down the onion's cells.
Add two tablespoons of water and stir.
Leave for ten minutes.
Pour surgical spirit down the inside of the jar.
Leave for 20 minutes.
After 20 minutes, a stringy white substance will appear in the top layer.
This is the onion's DNA.
We did a family quiz, to investigate
which traits are controlled by nature and which are left to nurture.
We finished off by compiling a family tree, back to grandparents.