U nit 3 D i f f e r en c e s
Lesson 3.2b Activity 3
ACT I VIT Y SH EE T
DNA – The secret of life
Fill in the blanks below:
We inherit features such as our eye ______________ and the______________ of our ears, from
our parents. Some of these features were fixed when we were born – for example, our
______________ ______________. Others, like body ______________, will keep changing as we
grow.
Most of our features depend on the ______________ we inherit. Genes are made of DNA and they
are kept in the ______________ of every cell.
To get the DNA out of a cell you need to break the ______________ ______________ down with
washing-up liquid.
The DNA dissolves in salty water but it does not dissolve in ice-cold ______________, so it slowly
comes out of the solution. Cells are tiny, but the genes from millions of ______________ can join
together to form visible strands of ______________.
106
alcohol
blood group
cells
cell membrane
colour
DNA
genes
nucleus
mass
shape
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