Leamy L
Growth. 1985 Winter;49(4):490-9.
Static allometric coefficients were estimated by regression and reduced major axis methods for second and third mandibular molar widths scaled on body weight in 42-day-old inbred and hybrid house mice. Phenotypic slopes were calculated by combining inbred and hybrid strains, and genetic slopes were obtained from differences among the strains. It was hypothesized that the genetic scaling, which reflects the expected evolutionary allometry between populations if they have been produced from directional selection on body weight alone, would exceed the phenotypic scaling. The genetic coefficients were generally higher (average regression estimates in inbreds = 0.65) than the phenotypic ones (comparable average = 0.47), but the differences were non-significant. It was concluded that the higher scaling of tooth dimensions in interspecies versus intraspecies comparisons typically found in previous studies therefore could not necessarily be explained as a secondary response to selection for body size, although more information is needed about trends in the scaling of mammalian teeth at different ages.
通过回归和主轴缩减法，对42日龄近交系和杂交家鼠第二和第三下颌磨牙宽度与体重的比例关系进行了静态异速生长系数估计。通过合并近交系和杂交系计算表型斜率，从品系间差异获得遗传斜率。研究假设，遗传缩放（如果仅对体重进行定向选择而产生的种群间预期进化异速生长）将超过表型缩放。遗传系数通常高于表型系数（近交系平均回归估计值 = 0.65）（可比平均值 = 0.47），但差异不显著。得出的结论是，尽管需要更多关于不同年龄哺乳动物牙齿缩放趋势的信息，但先前研究中通常发现的种间与种内比较中牙齿尺寸的较高缩放，不一定能解释为对体型选择的次级反应。
