The chromosomes in the germ-cells of Culex

✍ Scribed by Stevens, N. M.

• Publisher: John Wiley and Sons
• Year: 1910
• Tongue: English
• Weight: 686 KB
• Volume: 8
• Category: Article
• ISSN: 0022-104X
• DOI: 10.1002/jez.1400080207

✦ Synopsis

In the summer of 1905, Miss Boring and I collected material for the study of the spermatogenesis of the mosquito, but the germglands proved not to be sufficiently well fixed. In 1907 I spent several days studying aceto-carmine preparations from the larvae and pupa: of some California mosquitoes. Naturally I expected to find one or more heterochromosomes, but nothing of the kind could be detected either in the growth stages of the spermatocytes or in the maturation divisions. The number of chromosomes was small, only three in one species and four in theother,but i t was not an easy matter to determine whether or not the pairs of univalents were exactly equal. 'April 7, 1910. It is now quite certain that pupa of two species were used in this work. Al! of the material that can be obtained from the same pool this season will be examined with a view to determining the conditions in the germ cells of each species breeding there. A species of Anopheles with 6 chromosomes in the spermatocytes has already been found. 4 5 Bryn M a w College December z o , ~~' BIBLIOGRAPHY BORING, A. M. '07-A Study of the Spermatogenesis of Twenty-two Species of Jour. Exp. Zool., BUCHNER, P. 'oVDas accessorische Chromosom in Spermatogenese und Ovogenese der Orthopteren, zugleich ein Beitrag zur Kenntnis der Reduktion.