<Tr> <Td> </Td> <Td> This section needs expansion . You can help by adding to it . (December 2012) </Td> </Tr> <P> Genetics explains the process of parents passing down certain genes to their children . Genes are inherited from both biological parents, and each gene expresses a specific trait . The traits expressed by genes can be something physically seen--such as hair color, eye color, or height--or can be things such as diseases and disorders . </P> <P> Human genes are found within chromosomes . Humans have 23 pairs of chromosomes, 46 individual chromosomes. 23 chromosomes are inherited from the father, and 23 from the mother . Each chromosome can carry about 20,000 genes . </P> <P> Researchers have already connected the genes in the striped zebra fish which control the colour of the fish to genes in humans that determine skin colour . Many other things could be discovered in further years especially with the new possibilities of cloning animals . </P>

Where did the term designer baby come from