. Biology of the Heteromyidae. Heteromyidae. 246 PATTON AND ROGERS 2n =56 NA = 54. arenarius 42/64 pernix-t\ 38/56 per nix - b 36/56 rostrotus 52/56 penicillatus - A 46/48 penicillatus - â B 46/56 penicillatus - â¢C 46/54 nelsoni- p^ 46/58 nelsoni- B 48/58 intermedius 46/58 fallax 44/56 californicus 44/54 spin at us 44/54 baileyi 46/64-66 artus 54/54 goldmani 50-56/54-56 formosus 36/52 hispidus 34/64 Fig. 3. âSuggested phylogenetic relationships among extant species of pocket mice, Chaetodipus, based on chromosomal data. The number and type of chromosomal rearrangement occurring along each bra
. Biology of the Heteromyidae. Heteromyidae. 246 PATTON AND ROGERS 2n =56 NA = 54. arenarius 42/64 pernix-t\ 38/56 per nix - b 36/56 rostrotus 52/56 penicillatus - A 46/48 penicillatus - â B 46/56 penicillatus - â¢C 46/54 nelsoni- p^ 46/58 nelsoni- B 48/58 intermedius 46/58 fallax 44/56 californicus 44/54 spin at us 44/54 baileyi 46/64-66 artus 54/54 goldmani 50-56/54-56 formosus 36/52 hispidus 34/64 Fig. 3. âSuggested phylogenetic relationships among extant species of pocket mice, Chaetodipus, based on chromosomal data. The number and type of chromosomal rearrangement occurring along each branch are indicated (F = fusions, f = fissions, I = pericentric inversions, H = heterochromatin additions). Data are from non-differentially stained and C-banded karyotypes; homologies are based on proportional length and arm ratio. sion/fission; 27 independent occurrences) and non-Robertsonian ones (inversions/ translocations, including whole-arm hetero- chromatin shifts; 23 occurrences; see Fig. 3). This tabulation excludes consideration of C. hispidus and C. formosus. (7) Heterochromatin variation, with the exception of C baileyi (see below), appears to be minimal among species of Chaetodi- pus. C-bands are restricted to the centro- meric regions in C. goldmani (Fig. 4a), C intermedius, C. penicillatus-race A, C. spi- natus, and C. californicus. In C. arenarius, C-bands are present both at the centromeres and as whole arms of three small pairs of bi-armed autosomes. The centromeres of C formosus are C-band positive, as are the short arms of 6 of the 8 large subtelocentric autosomes; staining quality of the latter, however, is quite different from that of cen- tromeric C-bands, suggesting differences in underlying DNA sequences. Within-Species Variation Local polymorphism for supernumerary (B) chromosomes has been described for C. baileyi (see below); all other examples of within-species variation are limited to poly- typic geographic races. Five species are known to be com
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