Sickle cell anemia is a disease that is more prevalent in malarial zones due to \_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ because people who have partially sickled blood (heterozygotes) are less vulnerable to malaria. Disruptive selection Balancing selection Directional selection Stabilizing selection
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The passage states that heterozygotes (individuals with one sickle cell allele and one normal allele) are less vulnerable to malaria. Show more…
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Individuals with one sickle cell allele and one normal hemoglobin allele are not affected by the malaria parasite because of 1) stabilizing selection 2) disruptive selection 3) neutral mutations 4) frequency-dependent selection 5) heterozygote advantage.
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Heterozygous individuals for sickle-cell anemia have minor symptoms. Moreover, heterozygous individuals show an advantage with resistance to Malaria. Which type of selection can favor heterozygous while reducing homozygous recessive and homozygous dominant genotypes? Stabilizing selection Directional selection Oscillating selection Disruptive selection
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The human b-globin gene has two alleles, HS and HA. Individuals that are homozygous for HS have sickle-cell anemia and a lower fitness. Individuals that are heterozygotes (HSHA) do not show sickle-cell symptoms and have a resistance to malaria. Individuals that are homozygous for HA have the highest fitness but are susceptible to malaria. In areas where malaria is prevalent, the HS allele is maintained in the population. Which type of selection is occurring with the b-globin gene? A. directional. B. disruptive. C. negative frequency dependent. D. stabilizing. E. balanced.
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