We've long assumed our species evolved from a tidy, single stream of ancestors. But life on Earth is never quite so ...

Diagram how an exact replica of the genetic material is made ... Explain why it is useful to investigate functions of many human genes by studying simple model organisms such as yeast, nematode worms, ...

Characteristics are passed from parents to offspring. A gene is a small section of DNA that codes for a characteristic (e.g. eye colour). Alleles are different forms of the same gene, for example ...

One way to understand the function of a gene is to observe a biological system that lacks that gene. But what is the best system to use? When studying human genes, researchers typically employ ...