. The biology of spiders. Spiders; Insects. DEVELOPMENT 263 gynandromorphs are rarities, incapable of functioning as either sex. Gynandromorphs are well known among ants and in the fly Drosophila. In the latter case it has been shown that the cause of gynandry is the failure of an X chromo- some to keep pace with the others, so that in an early division of the egg it is dropped from one of the cells. This cell and all its descendants have thus one X chromo- some fewer than the others ; they show male characters, while the rest show female characters. Thus the resultant insect is a mosaic of ma
. The biology of spiders. Spiders; Insects. DEVELOPMENT 263 gynandromorphs are rarities, incapable of functioning as either sex. Gynandromorphs are well known among ants and in the fly Drosophila. In the latter case it has been shown that the cause of gynandry is the failure of an X chromo- some to keep pace with the others, so that in an early division of the egg it is dropped from one of the cells. This cell and all its descendants have thus one X chromo- some fewer than the others ; they show male characters, while the rest show female characters. Thus the resultant insect is a mosaic of male and female features. The subject of gynandry in spiders was treated in a paper by Hull in 1919. The instances which are there described may be classified in three groups, as follows : 1. One side male, the other female (Fig. 93).. Fig. 93. — Gynandro- morph Oedothorax fuscus. Left side male, right side fe- male. From Hull, after Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Savory, Theodore Horace, 1896-. London : Sidgwick & Jackson
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