Sickle-cell disease is a genetic disorder caused by a recessive allele for hemoglobin. out of 100,000 people, 1440 have the disease. about how many out of the 100,000 are carries (heterozygous) for the disease?

one part of the electromagnetic spectrum that arrives on earth as solar radiation from the sun is the visible spectrum. wavelengths of the visible spectrum combine to form what we refer to as

answer - d) ultraviolet radiation.

violet /   380–450 nm / 668–789 thz

violet is number 1 in the chart of visible light.