Because individuals who inherit the gene from only one parent produce red blood cells which are distorted. This distortion makes the cells unpalatable to malaria parasites, without seriously harming the individual. This tends to protect against malaria and that protection causes selection for this allele. Individuals who get the sickle cell gene from both parents suffer serious distortion of the red blood cells. This protects against malaria, but also reduces the oxygen-carrying capacity of the red cells to a dangerous degree. This causes a disease called sickle-cell anaemia, which causes selection against the gene. In malarial regions a balance is established. When a population with sickle cell alleles moves to an area with effectively no malaria present, the sickle cell alleles are steadily selected against. This shifts the balance steadily towards low levels.
malaria
No they are generally resistant to malaria
Yes, individuals who are heterozygous for sickle-cell anemia have a greater resistance to malaria due to the presence of the sickle cell trait which makes it more difficult for the malaria parasite to survive in the red blood cells.
Sickle Cell Anemia, in it's heterozygous form it does not present as the disease and it gives the carrier resistance to malaria.
Sickle cell anemia comes as the result of having two sickle cell chromosomes. One sickle cell chromosome makes people resistant to malaria. Unfortunately when people have two sickle cell chromosomes they can get sickle cell anemia. That makes it difficult for their blood to carry oxygen and under certain conditions makes their blood clump. The disease can be deadly. Drugs can help. It probably makes that person resistant to malaria. The sickle cell trait evolved in various places around the world where malaria is common such as Africa and Greece.
Malaria is common in topical ad subtropical zones. The malaria has selected the people with sickle cell anaemia. Although person with sickle cell anemia can have malaria, the carrier, or the person with sickle cell trait is resistant to malaria.
They are definitely not the same. If you are looking for an answer to WHY sickle-cell anaemia is BENEFICIAL to those with malaria then follow this link,What_is_the_benefit_of_sickle_cell_anemia_to_Africans_with_malaria
Sickle cell anemia provides resistance to malaria - it is ideal for many people in Africa that live in mosquito rampant areas.
the only human adaptation to malaria is sickle-cell anemia true?
malaria
Sickle-cell anemia
Sickle cell anemia is beneficial in regions with high malaria prevalence because it provides some degree of protection against the disease. In these regions, individuals with sickle cell trait have a survival advantage in fighting off malaria compared to those without the trait. However, in regions where malaria is not prevalent, the negative health effects of sickle cell anemia, such as anemia and organ damage, outweigh any potential benefits.