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A Comparative Analysis of the Chromosomes of the Guarani Group of Drosophila

James C. King
Evolution
Vol. 1, No. 1/2 (Mar. - Jun., 1947), pp. 48-62
DOI: 10.2307/2405403
Stable URL: http://www.jstor.org/stable/2405403
Page Count: 15
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A Comparative Analysis of the Chromosomes of the Guarani Group of Drosophila
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Abstract

The chromosomes of the six species of the guarani group of Drosophila are described and compared in metaphase and prophase of somatic mitoses and in salivary cells. Noticeable differences in metaphases and prophases can, with one exception, be explained as differences in amount and arrangement of heterochromatin. In one case the difference is the result of the loss of a centromere and the fusion of two chromosomes. The salivary chromosomes bear out these conclusions. Three of the species can be involved in crosses producing hybrids which make possible a more exact comparison of the chromosomes of these three species in metaphases, prophases and salivaries.

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