3.14

+ Chromosomes are the genetic information within a cell.
+ Chromosomes have DNA which forms a shape called a "Double Helix"
+ Genes controls the production of protein which controls a characteristic eg: Blood type.

+ Each species has a different amount of chromosomes per cell: eg: Cat= 38  Chicken= 78  Chimp= 42  Human = 46

+ They operate in pairs "Homologous"   -> based on the length
+ Looking at the same length place on each chromosome there will be the same gene loci -> same gene -> same place
+ Therefore there are two versions of each gene with 1 characteristic = Alleles