Abstract

Protozoan parasites of the phylum Apicomplexa have complex life cycles involving various types of asexual division that allow rapid proliferation of parasites within one or more hosts. Such replication is punctuated by obligate sexual differentiation that produces male and female gametocytes. These stages are transmissible to haematophagous vectors or are necessary ultimately to form resistant cysts that are released into the environment. This article examines the sexual differentiation of apicomplexan parasites as it relates to the timing of commitment and the mechanism of the switch from asexual proliferation to the development of male and female sexual stages.

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