How do micronuclei and macronuclei differ genetically

Could cells evolve strategies that change the balance, allowing a greater rate of DNA change gene evolution without jeopardizing species survival? The stichotrichs may, in fact, have evolved such a mechanism, dramatically modifying their germline DNA during evolution to facilitate creation of new genes without reducing the level of cell survival.

The ciliate strategy rests on the evolution of nuclear dimorphism: the inclusion both of a germline nucleus micronucleus and a somatic nucleus macronucleus in the same cell Figure 9. Like the example in Figure 9. The multiple micronuclei are genetically identical to each other, and the multiple macronuclei are genetically identical; these multiplicities of nuclei have no bearing on the issues addressed in this chapter.

The micronucleus is used only in cell mating, and its genes are silent. Hence, micronuclear genes do not support the maintenance, growth, or division of the cell. Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter. Please, subscribe or login to access full text content. To troubleshoot, please check our FAQs , and if you can't find the answer there, please contact us.

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Reference s : 1 Cavalier-Smith, T. Flagellate megaevolution: the basis for eukaryote diversification. In: Leadbeater, B. The Flagellates.

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Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake.