Cam Johnson - Why he fell to the 7th round

[xwalker]

From ninersnation:

Johnson was actually rated fairly highly by most analysts as far as his talent was concerned. A week ago, Mike Mayock ranked Cam Johnson No. 50 among all players. So why was he a seventh round pick? Well, health issues are prominent due to a sickle cell trait. It is not sickle cell disease or sickle cell anemia. The disease is more serious and involves a mutation of the hemoglobin gene, while Johnson's sickle cell trait produces both abnormal and normal hemoglobin.
http://www.ninersnation.com/2012/4/2...kle-cell-trait