In those parts of equatorial Africa where the malaria parasite is most common, the sickle-cell allele constitutes 20% of the β hemoglobin alleles in the human gene pool. 15. If the sickle-cell allele is recessive, what proportion of the population should be susceptible to sicle-cell anemia under typical conditions?

Answer is "0.04 Population"

Explanation:

The human body is a remarkable piece of work in which every part has its own function. Each part has a specific structure to best fit its function. When everything is structured (shaped) properly, it should function properly. However, there are many times when parts of the body are misshaped, and the deformed structure no longer allows for the body to function properlyThe function, or job, of red blood cells is to carry oxygen to all the organs in the body. They also get rid of the carbon dioxide (CO2), a poison in our bodies. They travel through a maze of blood vessels such as veins and arteries. To make for smooth travel through the body, normal red blood cells are shaped like little flexible disks. Their shape allows for them to bend and twist and move around the body in a smooth, fluid movement. Blood cells shaped like sickles can obviously not perform their function as wellAll red blood cells have a protein in them called hemoglobin (HEE-muh-glow-bin). Hemoglobin is what attaches the oxygen to the cell. A person with sickle cell anemia has some red blood cells that have a different kind of hemoglobin called hemoglobin S. Hemoglobin S causes a red blood cell to be deformed into a sickle shape. A sickle cell is stiff and sticky instead of smooth and flexibleHence the right answer is "0.04 proportion of population should be susceptible to sicle-cell anemia inder typical condition"

Ithink option a is correct because you cannot donate a different blood group than yours because it won't match.option a says betsy can donate to mark. they have the same blood group so donation can happen.