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Hydra viridissima is a species of cnidarian which is commonly found in still or slow-moving freshwater [2] in the Northern temperate zone. Hydra viridissima is commonly called green hydra due to its coloration, which is due to the symbiotic green algae Chlorella vulgaris which live within its body. [ 3 ]
A draft of the genome of Hydra magnipapillata was reported in 2010. [30] The genomes of cnidarians are usually less than 500 Mb in size, as in the Hydra viridissima, which has a genome size of approximately 300 Mb. In contrast, the genomes of brown hydras are approximately 1 Gb in size.
FISH is often used for finding specific features in DNA for use in genetic counseling, medicine, and species identification. [2] FISH can also be used to detect and localize specific RNA targets ( mRNA , lncRNA and miRNA ) [ citation needed ] in cells, circulating tumor cells, and tissue samples.
Genetic testing is often done as part of a genetic consultation and as of mid-2008 there were more than 1,200 clinically applicable genetic tests available. [23] Once a person decides to proceed with genetic testing, a medical geneticist, genetic counselor, primary care doctor, or specialist can order the test after obtaining informed consent.
Hydra polyps are small and transparent which makes it possible to trace single cells in vivo. In addition, transgenic Hydra provide a ready system for generating gain-of-function phenotypes. With the use of transgenes producing dominant-negative versions of proteins , one should be able to obtain loss-of-function phenotypes as well.
The well-known freshwater polyp Hydra viridissima, formerly placed in the Capitata, belongs to the Aplanulata. Polyorchis karafutoensis , a true member of the Capitata, on a 1995 stamp from Azerbaijan .