Physical Karyotyping: Genetic and Taxonomic Applications in Aspergilli
The karyotype is often used in genetics, either to characterise an individual as a member of a distinct species or to investigate chromosome recombination and segregation in crosses or in somatic cell division. A cytogenetic karyotype has been characterised in several fungi (see e.g. Fincham et al., 1979). Among those is Aspergillus nidulans in which 8 chromosomes have been recognised (Elliott, 1960), which compared quite well to the 8 linkage groups defined in genetic analyses. However, the morphology of the different chromosomes was not sufficiently different to study chromosome behaviour or anomalies and this approach was not continued. An additional drawback is that individual chromosomes could only be demonstrated in meiotic cells and therefore this method is not applicable to imperfect fungi.
KeywordsLinkage Group Neurospora Crassa Aspergillus Nidulans rDNA Cluster Chromosome Versus
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