The Chromosomes in Relation to the Determination of Sex in Insects
1905; American Association for the Advancement of Science; Volume: 22; Issue: 564 Linguagem: Inglês
10.1126/science.22.564.500
ISSN1095-9203
Autores Tópico(s)Insect and Arachnid Ecology and Behavior
ResumoMaterial procured during the past summer (1905) demonstrates with great clearness that the sexes of Hemiptera show constant and characteristic differences in the chromosome groups, which are of such a nature as to leave no doubt that a definite connection of some kind between the chromosomes and the determination of sex exists in these animals. These differences are of two types. In one of these, the cells of the female possess one more chromosome than those of the male; in the other, both sexes possess the same number of chromosomes, but one of the chromosomes in the male is much smaller than the corresponding one in the female (which is in agreement with the observations of Stevens on the beetle Tenebrio). These types may conveniently be designated as A and B, respectively. The essential facts have been determined in three genera of each type, namely (type A), Protenor belfragei, Anasa tristis, and Alydus pilosulus, and (type B), Lygœus turcicus, Euschistus fissilis, and Cœnus delius. The chromosome gro...
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