. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 484 Thorpe development because karyotypic studies (Cano et al. 1984) reveal no differen- ces in gross chromosome morphology between the sexes. Under this assump- tion sexual dimorphism in the mean and variance of a character is not determi- ned by a series of genes on a section of chromosome peculiar to only one of the sexes but is presumably due to genes being switched 'on' or 'off' by the internal biochemical environment once the sex is determined. Hypotheses
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 484 Thorpe development because karyotypic studies (Cano et al. 1984) reveal no differen- ces in gross chromosome morphology between the sexes. Under this assump- tion sexual dimorphism in the mean and variance of a character is not determi- ned by a series of genes on a section of chromosome peculiar to only one of the sexes but is presumably due to genes being switched 'on' or 'off' by the internal biochemical environment once the sex is determined. Hypotheses 1 to 3 below are considered in light of this assumption. However, recent karyotypic studies of G. galloti by Olmo (pers. comm.) show that a ZZ (o*), ZW (9) system operates with the appropriate part of the W chromosomes beeing largely hete- rochromatic. Hypothesis 1. Intensity of selection influences both max. SVL and varia- bility. That is, in barren hostile environments, with little primary production only a small max. SVL can be supported and the intensity of stabilising selec-. 20 AO 60 80 100 120 HO 160 180 200 body size, max SVL mm Fig. 3. Variability in scalation and body size. Vertical axis is the within-population varia- bility measured in units of D2 (see text) and the horizontal axis is the max SVL in mm. Linear regression line indicated with r = correlation, a = intercept and b = gradient. Symbols as for Fig 1 except stehlini from Gran Canaria = GC (circle). Fig 3a females, Fig. 3b 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 Zoologisches Forschungsinstitut und Museum Alexander Koenig. Bonn : Das Forschungsinstitut
Size: 1692px × 1477px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcoll, booksubjectbiology, booksubjectzoology
