NCBI Bookshelf. An Introduction to Genetic Analysis. New York: W. Freeman;
An ascospore is a spore contained in an ascus or that was produced inside an ascus. This kind of spore is specific to fungi classified as ascomycetes Ascomycota. Ascospores are formed in ascus under optimal conditions. Typically, a single ascus will contain eight ascospores. The eight spores are produced by meiosis followed by a mitotic division. Two meiotic divisions turn the original diploid zygote nucleus into four haploid ones.
Neurospora crassa is a type of red bread mold of the phylum Ascomycota. The genus name, meaning "nerve spore" in Greek, refers to the characteristic striations on the spores. The first published account of this fungus was from an infestation of French bakeries in Analysis of genetic recombination is facilitated by the ordered arrangement of the products of meiosis in Neurospora ascospores. Its entire genome of seven chromosomes has been sequenced.
Genetics of Microbes pp Cite as. The study of fungal genetics has made a number of significant contributions to our knowledge of genetic processes. The early idea of the connection between genes and enzymes was based on nutritional mutants of Neurospora , and rapid progress in bacterial genetics occurred when this approach and selective techniques were extended to Escherichia coli. One major advantage which some fungi have over bacteria is the occurrence of meiosis in a closed sac, the ascus in the ascomycetes. This allows the genetic effects of a single meiotic event to be studied in detail.