DNA and genetic information

3.16 Describe a DNA molecule as two strands coiled to form a double helix, the strands being linked by a series of paired bases: adenine (A) with Thvmine (T), and Cvtosine (C) with guanine (G).

Chromosomes are likely to contain thousands of genes.

At the gene loci you find a double helix.
They appear to be parallel.


These bases are holding together these two helix.

They are held together by pairing A - T and C - G.
These are known as the base pairs. This is always found in the DNA.

The order of molecules: A-C-T-G-A-A-C-C-A-G is what we call a gene.
The order of the basses ATGC and the number of the bases.