| Type | MGI:General | Description | homozygous females mated with homozygous males or wild-type males give birth to smaller litters, with a mixture of average size pups and low birth weight pups, which often die within 1 week of birth as well as some late gestation lethality; small litter size and pup mortality are not observed when homozygous males are mated with wild-type females or when heterozygotes are mated together |
