Science / Marine Biology / Genes: The hereditary material coded in cells that determine how an organism will look and behave. A gene is a single unit located on a chromosome and is thereby passed from one generation to the next. Genes are what make each species and individual unique. For example, genes are responsible for hair colour and texture in humans. See also chromosome, DNA.


Entertainment / Literature / Polygenesis: The theory that, if two similar stories, words, or images appear in two different geographic regions or languages, they are actually unrelated to each other. Each one arose independently. For an analo MORE

Tumor Suppressor Genes

Science / Biology / Tumor Suppressor Genes: Genes that normally keep cell division under control, preventing the cell from responding to internal and external commands to divide. MORE

Homeobox Genes

Science / Biology / Homeobox Genes: Pattern genes that establish the body plan and position of organs in response to gradients of regulatory molecules. MORE