The sickle-cell anemia allele is maintained at relatively high frequencies in some human populations because Blank______.Multiple choice question.the beta-globin gene mutates very frequently in those populationsheterozygotes for the disease allele are resistant to malariathe beta-globin gene is not subject to natural selection
Question
The sickle-cell anemia allele is maintained at relatively high frequencies in some human populations because Blank______.Multiple choice question.the beta-globin gene mutates very frequently in those populationsheterozygotes for the disease allele are resistant to malariathe beta-globin gene is not subject to natural selection
Solution
The correct answer is "heterozygotes for the disease allele are resistant to malaria".
This is because individuals who are heterozygous for the sickle-cell allele (meaning they have one copy of the normal allele and one copy of the sickle-cell allele) have a higher resistance to malaria. This is a classic example of balanced polymorphism - the sickle-cell allele causes a serious disease when two copies are present, but provides a survival advantage against malaria when only one copy is present. Therefore, in regions where malaria is prevalent, the sickle-cell allele is maintained at higher frequencies.
Similar Questions
The allele for the sickle cell mutation is most common in Blank______.Multiple choice question.AmericaSouthern AfricaCentral AfricaNorthern Africa
The frequency of the sickle cell mutation among populations in Central Africa is Blank______ that found among African Americans.Multiple choice question.equal tolower thanhigher than
Which of the following is true?1 pointNone of the answers providedSickle cell anemia is an infectious disease of the lung.Sickle cell anemia confers almost 100% resistance to malaria.A mutation in one gene copy of the hemoglobin coding gene is sufficient to cause sickle cell anemia.
The allele for sickle cell anemia leads to multiple changes in the individual's phenotype, including the type of hemoglobin produced, the shape of red blood cells, the onset of anemia, and reduced susceptibility to malaria. The name for these multiple effects on phenotype is ______.Multiple choice question.polygenic inheritancepleiotropygene interactionpseudodominance
Different alleles of genes are found within different individuals of a population. This is known as Blank______,Multiple choice question.genetic driftgenetic variationnatural selection
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