Twenty-two randomly taken morphological characters were used in order to estimate the Mahalanobis generalized distance between diploid males, diploid workers, haploid males and triploid workers. It was found that adult diploid males are metamales and triploid females are slightly masculinized. These facts indicate that the maleness genesare slightly additive.

The hardening of the zona pellucida as a result of the cortical reaction was estimated in triploid oocytes produced with cytochalasin B by two different procedures. Triploid oocytes resulting from fertilization in the presence of cytochalasin B did not reveal hardening of the zona pellucida unlike triploids obtained by inhibiting in-vitro extrusion of the second polar body in oocytes fertilized...

Walleye (Sander vitreus) provide important recreational and commercial fisheries throughout the United States and Canada. In Colorado, more walleye are stocked every year than any other species of fish. Use of sterile triploid fish in Colorado is an important management strategy for protecting native endangered fish species from naturally reproducing populations of introduced predators like wal...

Growth and muscle cellularity of diploid and triploid Atlantic cod (Gadus morhua Linnaeus, 1758) larvae Cecilia Campos Vargas*1, Stefano Peruzzi2, Ørjan Hagen1 1 Faculty of Biosciences and Aquaculture, University of Nordland, Bodø, Norway 2 Faculty of Biosciences, Fisheries and Economics, University of Tromsø, Norway Correspondence: Cecilia C Vargas, University of Nordland, Universitetsalleen 1...

HE yeast Saccharomyces cerevisiae normally alternates between haploT phase and diplophase, propagating vegetatively primarily as a diploid (WINCE 1935). SUBRAMANIAM and coworkers ( SUBRAMANIAM and KRISHNA MURTHY 1949; MITRA and SUBRAMANIAM 1949 ; SUBRAMANIAM 1951) have reported the production of tetraploids by the exposure of diploid yeast to acenaphthene and chrysene. Their data lack any genet...

Material and methods. ................................. A brief resume of meiotic behavior in diploid individuals. Meiosis in the triploid individual. ....................... Plaamodial sporogenous tissue. .......................... Chromatin extrusion in sporogenous tissue ................ TheF~generation ..................................... Meiosis in Fr individuals. ...........................

Five specimens of Rhamdia quelen collected from the Lindóia Stream, PR, Brazil, were cytogenetically analyzed. The diploid chromosome number found was 58, including 30 metacentric, 16 submetacentric, 10 subtelocentric, and 2 acrocentric chromosomes. Supernumerary or B chromosomes, frequently observed in this fish group, were not detected. One of the individuals was triploid, with 3n = 87. A sil...

Diploid/triploid mosaicism is an uncommon malformation syndrome thought to result from incorporation of the second polar body into a blastomere nucleus of the developing embryo. Clinical manifestations include mental and growth retardation, truncal obesity, body asymmetry, hypotonia, syndactyly, clino-/camptodactyly, malformed low-set ears, and small phallus. Although muscular atrophy has been ...

The purpose of this study was to assess paralytic phycotoxin uptake in diploid and triploid oysters at two stages of their sexual cycle corresponding to their status in early summer (June) and winter (November). Samples of diploid and triploid oysters were exposed to a toxic culture of Alexandrium minutum for 4 days in each season. No significant differences in filtration or clearance rates wer...