Affiliation:
1. Departamento de Genética, Facultad de Ciencias, Universidad de Granada, Spain
Abstract
Decades ago, the presence of extra chromosomes restricted to the male germ line in several grasshopper species was interpreted as recurrent polysomy, as experimental crosses suggested that the extra chromoso- mes were not transmitted from adult male parents to their embryo offspring.
Under this hypothesis, polysomy was generated de novo through a nondisjunction for some chromosomes of the standard karyotype. In the current study, I test this hypothesis by analysing 17 families of tandem repeats (TRs) in two males of the grasshopper Chorthippus parallelus,
which displays mosaicism for this kind of extra chromosome. According to the de novo polysomy hypothesis, the extra chromosomes should show the same FISH pattern for the TRs analysed as at least one of the A chromosomes. However, three TR families displayed patterns of FISH bands on
the standard and extra chromosomes that ruled out the former as a possible source for the latter. Therefore, these extra chromosomes are best interpreted as B chromosomes restricted to the germ line, presumably present in both sexes, which are inherited as such and are not recurrently generated
de novo from the A chromosomes. Key words: Extra chromosomes, FISH, polysomy, tandem repeats
Publisher
Institute of Systematics and Evolution of Animals, Polish Academy of Sciences
Subject
General Biochemistry, Genetics and Molecular Biology,General Medicine
Cited by
1 articles.
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