Haploid intersexes in the wasp Habrobracon

Haploid females in the parasitic wasp Nasonia vitripennis.

The insect order of Hymenoptera (ants, bees, sawflies, and wasps) consists almost entirely of haplodiploid species. Under haplodiploidy, males develop from unfertilized eggs and are haploid, whereas females develop from fertilized eggs and are diploid. Although diploid males commonly occur, haploid females have never been reported. In analyzing the phenomenon of gynandromorphism in the parasito...

Genetically Nontransmissible Nuclear Damage Induced by Ultraviolet Radiation in the Wasp Habrobracon.

N Habrobracon, unfertilized eggs develop normally and become haploid males; I fertilized eggs become diploid females. It has been observed that when newlylaid eggs from virgin females are exposed to ultraviolet radiation on the nuclear (convex) surfaces, embryo hatchability decreases as the exposure time is increased (VON BORSTEL and MOSER 1956; VON BORSTEL and WOLFF 1955). Most of the deaths o...

Radiation-induced Dominant Lethality in Haploid and Diploid Sperm of the Wasp Mormoniella.

I N yeast, more dominant lethality is induced in diploid than in haploid vegetative cells (OWEN and MORTIMER 1956), and this is consistent with the observed increase in X-ray sensitivity of cells of higher ploidy in this organism ( MORTIMER 1958). To study dominant lethality with respect to ploidy in a higher organism, the parasitic wasp Mormoniella was selected. Stocks are available which prod...

Cytogenetical studies on swine intersexes.

Intersexes of Leptonchus obtusus Thorne.

develop, the intrinsic microflora are either absent or, more likely, present at a very low titer. If they are present at a low level, they will not cause carrots to rot before the nematodes have increased, and they can be eliminated from the nematodes by surface-sterilization. Pratylenchus vulnus was originally obtained from around Juglans hindsii Jepson rootstock in a walnut orchard, and has b...