Moth



Blackwell Publishing

Sickle cells

sickle_cell_anaemia.jpg

Sickle cell anemia is the classic example of heterozygous advantage. In a heterozygote, the allele for sickle cell hemoglobin causes resistance to malaria. In a homozygote, these alleles produce sickle cell hemoglobin, which causes red blood cells to become curved; they then block up the capillaries causing severe anemia.

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