Answer:
Sickle-cell anaemia is an autosomal
recessive disease caused by haemoglobins anoxygen carrying protein in blood
cells.
Despite the disease's lethal symptoms,
it protects the carrier from malaria. Its allele are most common in the people
of African descent (about 7% people of African descent carry anallele) and some
other areas where malaria in prevalent.
It provides the vital protection
from malaria. Individuals with HbAS heterozygotes tend to survive better than
individuals with HbSS (homozygotes) as they are not exposed to the same
severity of risk.
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