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You have mistakenly used sickle cell as an example of a recessive gene, whereas in fact it is co-dominant, meaning people with one copy of the sickle allele have some health problems associated with the allele; this condition Ss is called sickle cell trait. Importantly, you should also explain why sickle cell trait has been conserved in the population, as it has adaptive advantages in populations who have exposure to malaria, as the parasite will not affect sickle cell trait sufferers but will affect those with normal haemoglobin.