Phylum Ascomycota

Phylum Ascomycota - Neurospora crassa , the organism used...

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Phylum Ascomycota The Phylum Ascomycota contains more than 30,000 species ranging in body style from of unicellular yeasts to multicellular fungi such as morels. Yeasts reproduce asexually by budding and sexually by forming a sac (or ascus ). One yeast, Saccharomyces cerevisiae , is important for genetic research as well as its commercial applications in baking and brewing. Yeasts are part of the Human Genome Project and serve as easily studied models for eukaryotic gene systems. Yeast chromosomes have also been modified to serve as vectors for transporting human DNA fragments for use in gene mapping . Other notable ascomycetes include Morchella esculentum , the morel, and
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Unformatted text preview: Neurospora crassa , the organism used by George Beadle and Edward Tatum to develop the "one-gene-one-enzyme" hypothesis. Some ascomycetes also cause disease of can make chemicals associated with diseases. In this group are Aspergillus flavus , which produces a contaminant of nuts and stored grain that acts both as a toxin and the most deadly known natural carcinogen. Candida albicans is another sac fungus that causes diaper rash and vaginal infections. Clearly this group, which may include nearly three-fourths of the fungal specis, offers humans both blessings as well as curses. Representtaives of this diverse group are shown in Figure 5....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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