BSMV infection caused a pronounced increase in the frequency of triploid and aneuploid seeds in eleven barley varieties, but with considerable variation in frequency among varieties. In some of the varieties triploids exceeded three per cent. In virus-free material a few triploids were found in most of the varieties, but the frequency was very low. There was, however, a significant variation am...

This work shows that the atypical erythrocytes in triploid rainbow trout Oncorhynchus mykiss were morphologically similar to those of toads. The nuclei of the cells can be bell-shaped, constricted or irregular. It is presumed that such nuclear division is probably amitosis.

females in their large eye facets, stout bristles and coarse wings, and resemble diploid metafemales in their rough eyes and narrow wings with cut and excised inner margins. Viability of triploid metafemales is much higher than that of diploid metafemales and they are also partially fertile. Five of the 49 triploid metafemales collected were fertile, these 5 producing a total of 48 offspring. T...

As shown by DOBZHANSKY and BRIDGES (1928), triploid intersexes in Drosophila may be considered as individuals developing up to a certain moment as males and thereafter as females. The earlier or later occurrence of the turning point in the development of an intersex determines the production of an individual manifesting relatively more male or relatively more female characteristics. If the turn...

The classical balance concept of sex determination in Drosophila states that the X-chromosome carries dispersed female-determining factors. Besides, a number of autosomal genes are known that, when mutant, transform chromosomal females (XX) into pseudomales (tra), or intersexes (ix, dsx, dsx). To test whether large duplications of the X-chromosome have a feminizing effect on the sexual phenotyp...