heredity as the process by which genetic information is transmitted from one generation to the next
a simple model of chromosomes, genes and DNA in heredity, including the part played by Watson, Crick, Wilkins and Franklin in the development of the DNA model
differences between species
the variation between individuals within a species being continuous or discontinuous, to include measurement and graphical representation of variation
the variation between species and between individuals of the same species meaning some organisms compete more successfully, which can drive natural selection
changes in the environment which may leave individuals within a species, and some entire species, less well adapted to compete successfully and reproduce, which in turn may lead to extinction
the importance of maintaining biodiversity and the use of gene banks to preserve hereditary material