Cite web URL http://www.nature.com/scitable/definition/chromosome-chromosomes-eukaryotic-chromosome-eucariotic-chromosome-procariotic-6 Title chromosome URL access date 1 April 2014 ↑ "what is a gene". Retrieved 1 April 2014. Cite web URL http://kidshealth.org/kid/talk/qa/what_is_gene.html Title what is a gene URL access date 1 April 2014 ↑ "what is a gene".