If you think of the “trait” here as whether or not you have sickle-cell anemia, then the allele for sickle cell is recessive. You need two copies to make you sick. But this does not work the same as ...
Researchers have found that being a carrier for sickle cell disease, known as having sickle cell trait, increases the risk of blood clots, a risk that is the same among diverse human populations that ...