| Type | MGI:General | Description | matings between F1 heterozygotes result in abnormal Mendelian ratios of male F2 progeny (28:20:12), whereas genotype ratios of female progeny are normal (15:31:11) however, equal numbers of males (60) and females (56) reach weaning age, despite differences in genotype ratios of male and female weanlings, suggesting a possible pre-implantation defect |
