Sickle cell anaemia is a genetic disorder that leads to severe illness in homozygous individuals. In certain human populations, being heterozygous may be advantageous. What could account for this?
- AHeterozygous individuals are not affected by the disorder.
- BHeterozygous individuals are more resistant to malaria.
- CThe disorder is caused by a dominant allele.
- DThe disorder is sex-linked.