Disease
This chapter talks about the different blood types and each of their characteristics. They speak of O being the universal donor and who can donate to who. It also speaks of immunity and susceptibility to different diseases like cholera (A and AB) and malaria (O). The example used is sickle-cell disease vs. malaria. It is known that many of the African population carry either one or both genes for sickle-cell anemia because of the link to the allele’s resistance to malaria. Ridley explains that many alleles of these type of alleles are difficult to get rid of because some contribute to the resistance of more severe diseases. Basically this chapter says there is no stable changes. Genome will keep changing and evolutionizing.
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