Clark M M, Galef B G
Department of Psychology, McMaster University, Hamilton, Ontario, Canada.
Dev Psychobiol. 1990 Jan;23(1):29-37. doi: 10.1002/dev.420230104.
We examined reproductive tracts of 253 female Mongolian gerbils (Meriones unguiculatus) and recorded the uterine locations (relative to siblings of opposite sex) in which 812 male and 823 female fetuses were found. Within-litter comparisons revealed that sexes were not distributed randomly across uterine horns. The percentage of males in right horns (55.0%) was greater than the percentage of males in left horns (41.8%) and the percentage of females in right horns (45.0%) was significantly less than the percentage of females (58.2%) in left horns. We did not find differences in the total number of fetuses in left and right uterine horns or a sex bias in the total sample of 1635 fetuses. Results were discussed in terms of: (a) effects of sexual segregation of fetuses on expected probabilities of fetuses developing adjacent to 0, 1, or 2 fetuses of opposite sex and (b) consequent alterations in expected frequencies of behavioral phenotypes in populations of gerbils.
我们检查了253只雌性蒙古沙鼠（长爪沙鼠）的生殖道，并记录了发现812只雄性和823只雌性胎儿的子宫位置（相对于异性同胞）。同窝内比较显示，性别并非随机分布于子宫角。右角中雄性的百分比（55.0%）高于左角中雄性的百分比（41.8%），右角中雌性的百分比（45.0%）显著低于左角中雌性的百分比（58.2%）。我们未发现左右子宫角中胎儿总数存在差异，也未在1635只胎儿的总样本中发现性别偏差。结果从以下方面进行了讨论：（a）胎儿性别隔离对与0、1或2只异性胎儿相邻发育的胎儿预期概率的影响，以及（b）沙鼠种群中行为表型预期频率的相应改变。
