3.15

objective 3.15. understand that a gene is a section of a molecule of D.N.A.

*D.N.A. is in a double helix shape. a section of the molecule is called a gene

*genes have information which has a characteristic of an organism e.g. blood group or petal colour -in a flower-

genes are located in the nucleus. this information passed to cytoplasm

in cytoplasm genetic information is transformed into a protein which controls the production of the characteristic,

the information flows to the gene (in nucleus) to protein (in cytoplasm)