A mutation in the human gene responsible for producing hemoglobin in the blood can cause a disorder known as sickle-cell anemia. The parents of children born with sickle-cell anemia usually have no systems of the disorder, but tests indicate that both parents have the mutated gene. How can this be explained?

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

Creation of an unnaturally uniform sample to represent a diverse populationcan be avoided by: a. including only willing b. asking another scientist for .c. choosing only identical participants.d. selecting individuals at random.

How did the discovery of the rhesus factor affect society? o more patients died from having a transfusion with the wrong rhesus factor 0 new treatments during pregnancy could prevent harm to the developing child. o less donated blood could be used in the treatment of patients. the number of blood types was reduced by half