Question

All of the following regarding sickle cell anemia phenotype is true, except: a. Sickle cell trait...

All of the following regarding sickle cell anemia phenotype is true, except:

a.

Sickle cell trait in HbB/HbS heterozygotes gives them resistance to malaria

b.

Properties of oxyhemoglobin are severely affected by HbS substitution

c.

Both alleles in hemoglobin beta-chain (HbB) gene are mutated in a full-blown condition

d.

Solubility of deoxyhemoglobin is decreased

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Answer #1

1. Answer: Option B is correct
Explanation:
HbA = WT allele
HbS = Mutant allele

HBA/HbA = Normal; Sensitive to Malaria
HBA/HbS = Carrier; Resistant to Malaria
HBS/HbS = Homozygous mutant; Sickle cell anemia

HbS mutation decreases the solubility of deoxyhemoglobin. However, it does not significantly affect the solubility of oxy-hemoglobin.


HbS mutation alters the shape of the protein. It does not alter some properties such as Oxygen-binding of Hemoglobin.

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