. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DNA AND CYTOTAXONOMY OF MANTIDS 179. FIGURE 1. Spermatogonial metaphase—Liturgousa may a. FIGURE 2. Same—Liturgousa actuosa. FIGURE 3. Same—Liturgousa cursor. (All drawings made with camera lucida, at table level; Zeiss apochrom. obj. 90, comp. oc. 20; magnification as reproduced is uniform in all and indicated by scale on each. Fixation Sanfelice; stain Feulgen.) that changes in total amount of chromosome material, as well as changes in its dis- tribution and in number of kinetochores, have been associated with this diverge
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DNA AND CYTOTAXONOMY OF MANTIDS 179. FIGURE 1. Spermatogonial metaphase—Liturgousa may a. FIGURE 2. Same—Liturgousa actuosa. FIGURE 3. Same—Liturgousa cursor. (All drawings made with camera lucida, at table level; Zeiss apochrom. obj. 90, comp. oc. 20; magnification as reproduced is uniform in all and indicated by scale on each. Fixation Sanfelice; stain Feulgen.) that changes in total amount of chromosome material, as well as changes in its dis- tribution and in number of kinetochores, have been associated with this divergence. Measurement of metaphase chromosomes in any species can, however, at best give but an approximate index of the amount of chromosome material, for differ- ences in intensity of dye and tightness of coiling cannot be adequately appraised. It was therefore hoped that the photometric determination of the relative amount of DNA in the interphase nucleus, by providing a more accurate index of the sub- stance measured in Feulgen-dyed metaphase chromosomes, might elucidate the in- terrelationship of the Liturgousa species. With the dual purpose, first, of providing a standard of comparison for possible interspecific differences in the nuclear DNA content among the Liturgousa species, and second, of ascertaining whether or not cytotaxonomically useful constants of nuclear DNA content characterize different subfamilies, measurements were also made on a second group of mantids from the very distantly related subfamily Man- teinae. These were chosen on the basis of close similarity in karyotype, and include TABLE I Average total length, in arbitrary units, of metaphase chromosomes Species Chromosomes 2nd1 Spermato- gonia Number measured Meiosis II Number measured Liturgousa maya 16+X 3 Liturgousa cursor 32+X 3 Liturgousa actuosa 22+X 3 Choeradodis rhombicollis 28+X'X2Y 3 Stagmomantis Carolina 24 + X'X2Y 4 4 Stagmomantis heterogamia 24 + X'X2Y *
Size: 2685px × 931px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
