66)Parasites are organisms that make a living at the expense of another organism called a host. In populations of hosts and parasites, not all the possible parasite genotypes can successfully infect all the possible host genotypes. The most successful parasite genotypes (i.e. those with the highest fitness) are those that can exploit the most common host genotypes. As a result, the most common host genotypes suffer a decline in fitness. Meanwhile, rare host genotypes are relatively unaffected by parasites and thus enjoy a higher fitness which causes them to become more common. As a host genotype becomes more common, it also becomes a bigger target for parasites and eventually experience a decline in fitness. This is a case of Stabilizing selection   Negative frequency dependent selection   Disruptive selection   Purifying selection

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Parasitic infections

A parasite is an organism that lives in the body of another organism and obtains food at the expense of the host. There are two kinds of parasites they are internal and external. An internal parasite lives inside another organism and is known as endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite.