Changes

All DNA required for a cell to grow into organism is called genome. A cell containing only one genome is called a haploid cell. Humans are diploid (one genome from each parent). Other organisms may have cells with more genomes, for instance, a cell of bread [[wheat]] contains six (hexaploid).

All DNA required for a cell to grow into organism is called genome. A cell containing only one genome is called a haploid cell. Humans are diploid (one genome from each parent). Other organisms may have cells with more genomes, for instance, a cell of bread [[wheat]] contains six (hexaploid).

==History==

==History of DNA research==

In the late 19th century [[Friedrich Miescher]], a Swiss [[biochemist]], discovered an unusual [[acid]] in the [[nuclei]] of cells. The acid was named deoxyribonucleic acid, or DNA. In 1944 the American [[biologist]]s, [[Alfred Hershey]], [[Thomas Gilmore]] and [[Martha Chase]] used experiments with [[bacteria]] and [[bacteriophage]]s to show that DNA passed [[gene]]s from one generation to the next.

In the late 19th century [[Friedrich Miescher]], a Swiss [[biochemist]], discovered an unusual [[acid]] in the [[nuclei]] of cells. The acid was named deoxyribonucleic acid, or DNA. In 1944 the American [[biologist]]s, [[Alfred Hershey]], [[Thomas Gilmore]] and [[Martha Chase]] used experiments with [[bacteria]] and [[bacteriophage]]s to show that DNA passed [[gene]]s from one generation to the next.