14. Genes and behavior

Genes, the basic parts of cells which are passed down from parents to children, may have something to do with human behaviour. In an experiment, scientists putt flies into a class tube and placed a light at the end of it. Some of the flies began flying toward the light, some began walking and some did not move at all. On the basis of the flies actions, they were separated into different groups. Flies that love light, flies that light like and flies that like the dark. The researchers found that these three groups of flies had variations in particular set of genes. These suggested to the researchers, that the variations in these genes might explain the differences in the flies' behaviours. If genes influence behaviours of flies, why not in humans too.