. Bulletin of the British Museum (Natural History). 326 E. N. ARNOLD ") Degree of change from orig/no/ condition of organ Normalising selection suppressing pleiotropic^ effects Return to ± original condition and efficiency. Time - Pleiotropic change in male reducing copulatory efficiency b) Degree of change from original condition of organ Normalismg selection /^ suppressing pleiotropic \ effects ^\ ^^ Restoration of full efficiency but with changed structure ^â^ Original condition of genitals Compensating selection acting on female system 9 l\me â Fig. II. For explanation se« text. has
. Bulletin of the British Museum (Natural History). 326 E. N. ARNOLD ") Degree of change from orig/no/ condition of organ Normalising selection suppressing pleiotropic^ effects Return to ± original condition and efficiency. Time - Pleiotropic change in male reducing copulatory efficiency b) Degree of change from original condition of organ Normalismg selection /^ suppressing pleiotropic \ effects ^\ ^^ Restoration of full efficiency but with changed structure ^â^ Original condition of genitals Compensating selection acting on female system 9 l\me â Fig. II. For explanation se« text. has so far been encountered in lizard hemipenes. However, this factor may have some effect. Although there are reasons for believing that hemipenial characters may fre- quently be particularly good indicators of relationship, they are not infallible pointers and must be treated with as much caution as any other type of character. For it is quite probable that they are altered by direct environmental selective. 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 British Museum (Natural History). London : BM(NH)
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