, Volume 56, Issue 2, pp 143-155

Effect of triploidy on the body size, general organization and cellular structure inGasterosteus aculeatus (L)

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1. In experimentally produced triploidGasterosteus aculeatus, the body size is similar to that of the normal diploid forms, but the proportions of the trunk and tail to the body size are different. In triploids the trunk is proportionately shorter and the tail longer than in the diploid controls.

2. In the triploids, the nucleus and the cell size in cartilage, blood and nerve cells etc. are much larger and approximately bear a ratio of 3:2 to those of the corresponding cells in the diploid individuals.

3. The different organs like brain, retina, occipital arch, pronephric ducts etc., remain of the same size in both the triploids and the diploids; however, the number of cells in the triploid organs is less than those of the diploid.

4. In the triploid forms, the increase in size of the cells is compensated by a corresponding decrease in the number of cells, because in both the cases the size of the different organs remains more or less the same.