- What are DNA, genes and chromosomes?
- What do genes code for?
- Why are we unique?
- How do we inherit characterisitics from our parents?
DNA, Chromosomes and Genes.
You may remember from S1 that the nucleus controls the activities of the cell. This is because the nucleus contains a very special molecule which provides the instructions for a living thing. This molecule is DNA.DNA is a very long molecule because, as you can imagine, there are many, many instructions needed to make a living thing. To get all of these instructions to fit into a tiny cell the DNA is wound up very carefully into structures called chromosomes.
Now let us take a closer look at a simplified model of DNA:
This shows us that DNA is made up of four different chemicals. These chemicals can be represented by the letters: A, T, C and G.
We can read the message by reading one side of the molecule from top to bottom. In class you will get the opportunity to decode some DNA messages!
The long molecule which contains the genetic blueprint for life is DNA.
Found on chromosomes, a bit of DNA which codes for a protein is called a gene.
DNA is organised into rod like structures which are called chromosomes.
Why are we unique?