Chromosomes: genetic information within a cell
Chromosmes is composed of a molecule called DNA
DNA has a shape known as the double helix
section's of DNA are called genes, a chromosome is composed of 1000's of genes (DNA = 3.15)
each gene has the information for the construction of the protein (see 3.16)
The protein gives the characteristics associated with the gene (eg. Blood group)
Different organisms have different numbers of chromosomes (eg cat = 38, chicken = 78, chimp = 42, humans=46 chromosomes per cell)
Chromosomes are known to work in pairs (homologous pairs)
(3.17)
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