1. Chromosomes > genetic information within a cell
2. Cell > Nucleus > Chromosomes
3. Chromosome is composed of a molecule known as DNA - Deoxyribo nucleic acid > forms a shape known as the double helix
4. Sections of the molecule are called genes > one chromosome has many genes > possible thousands
5. Each gene carries the information for the construction of a protein > the protein gives characteristic associated with the gene > eg. a blood group
6. Different organisms have a different number of chromosomes > Cat = 38 > Chicken = 78 > Chimp = 42 > Human 46
7. Chromosomes are known to operate in pairs > pairs known as homologous pairs > homologous nature is based on the length of the chromosomes
8. The gene loci, between the homologous pair, we will find the same gene on both sides > giving 2 versions of each gene.
9. Versions are called alleles
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