Cytogenetic Studies in North American Minnows (cyprinidae). Iv. Somatic Polyploidy in Gila Bicolor
نویسنده
چکیده
The kidney tissue of a single individual of the California minnow Gila bicolor (Girard) contained polyploid cells in about 1.7% frequency. Chromosome spreads of triploid, tetraploid, hexaploid, octaploid, and dodecaploid cells were observed and may have arisen thmugh endoreduplication of ancestral diploid and triploid cells. The cytological mechanism producing the triploid cells is unknown. Diplochromosomes were not present. The distribution of pfoidy in cells of this individual is not random. In particular, cells having undergone one round of chmmosomal increase appear increasingly susceptible to additional rounds of chromosomal gain.
منابع مشابه
Cytogenetic Studies in North American Minnows (Cyprinidae) I. Karyology of Nine California Genera
Your use of the JSTOR archive indicates your acceptance of JSTOR's Terms and Conditions of Use, available at http://www.jstor.org/page/info/about/policies/terms.jsp. JSTOR's Terms and Conditions of Use provides, in part, that unless you have obtained prior permission, you may not download an entire issue of a journal or multiple copies of articles, and you may use content in the JSTOR archive o...
متن کاملThe relationship of spawning mode tb- conservation of North American minnows (Cyprinidae)
Approximately 20% of North American minnows are considered imperiled. The factors responsible for imperilment in this group are complex, but the relationship of spawning mode to conservation of North American minnows has not been explored. 1 provide a summary of the spawning modes of imperiled North American minnows, discuss patterns between these modes and conservation status, and predict the ...
متن کاملAssessing contaminant sensitivity of endangered and threatened aquatic species: part III. Effluent toxicity tests.
Toxicity tests using standard effluent test procedures described by the U.S. Environmental Protection Agency were conducted with Ceriodaphnia dubia, fathead minnows (Pimephales promelas), and seven threatened and endangered (listed) fish species from four families: (1) Acipenseridae: shortnose sturgeon (Acipenser brevirostrum); (2) Catostomidae; razorback sucker (Xyrauchen texanus); (3) Cyprini...
متن کاملIs evolution gradual or rectangular? Evidence from living fishes.
The traditional view that most evolutionary change is gradual and cumulative within lineages (phyletic gradualism) has recently been challenged by the proposition that the majority of evolutionary change is concentrated within speciation events (rectangular evolution). The logical implications of these competing hypotheses for the means and variances of genetic distance among living members of ...
متن کاملDo Digestive Processes Leave Diagnostic Traces on Fish Bones ?
This study examines the extent to which fish remains are affected by digestive processes and includes experimental and comparative analysis of tui chub (Cyprinidae: Gila bicolor) fish remains from modern human feeding experiments, modem coyote scats and archaeological human coprolites. Body part representation varies across the samples, but overall, bone loss resulting from digestive process is...
متن کامل