Cystic fibrosis is the most common lethal genetic disorder in caucasians. individuals who are homozygous recessive for this trait have a defect of a membrane transporter protein. as a result, they have alterations in amounts of body fluids such as sweat and mucus; thickened mucus often leads to fatal lung infections. when scientists see that a fatal disorder is present in a population at a relatively high frequency, they suspect that there may be some benefit to the genes present. this benefit is called: group of answer choices