MONG species of insects that have been used for genetic studies, there Aoccasionally appear adults which are composed of two or more different genomes. In Drosophila melanogaster, where most of these mosaics were of the gynandromorph type, it has been shown that elimination of an X chromosome during early cleavage was involved (MORGAN and BRIDGES 1919; PATTERSON 1931). In a few instances, ferti...

The two autonomously manifesting mutations, eyeless (el) and white eyes (wh), of Habrobracon juglandis were compared phenotypically with the wild-type. Eyeless reduces the compound eyes in size. The penetrance is 100%, while expressivity ranges from point-shaped ommochrome crumbs over individual facets to a small eye with abundant facets. There is no correlation between the sizes of left and ri...

Black walnut ( Juglans nigra ) is considered one of the most valuable plants, with a global production 3.5 million tons dried fruit yearly. Throughout past two millennia, its allelopathic effects have been widely recognized. walnuts produce natural naphthoquinone called juglone, which occurs naturally in all parts tree, particularly green husk, and contributes significantly to black walnut. Exc...