People who are heterozygous for sickle cell anemia have the “sickle cell trait.” this is a much milder form of the disease. looking at the image below, what can you infer about having the sickle cell trait and malaria?
a. the genotype for the sickle cell trait is manipulated by natural selection.
b. it is better to have the sickle cell trait in areas where malaria is uncommon.
c. having the sickle cell trait in regions where malaria is not prevalent carries a higher fitness.
d. having the sickle cell trait in regions where malaria is common carries a higher fitness.

C. Having the sickle cell trait in regions where malaria is not prevalent carries a higher fitness.

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.