Resources:

 

Color Blindness, John Walkman. (n.d.). Retrieved from http://en.wikipedia.org/wiki/Color_blindness

 

Dna,genes, chromosomes. (2012). Retrieved from http://geneed.nlm.nih.gov/topic_subtopic.php?tid=15

 

X chromosomes. (2012, Jan.). Retrieved from http://ghr.nlm.nih.gov/chromosome/X