Recessive, heterozygotes recognizable. Homozygous adults are virtually nude except for vibrissae and sensitive hairs which exist as short stumps.
Some individuals have normal shaped, but short vibrissae.
The trait can be detected in newborn deer mice by the twisted appearance of the vibrissae. Animals begin to lose hair about twelve days of age, following a period during which the coat has a distinctive sheen. Juveniles have dark pigmented bodies with pink faces. Transient coats appear at subadult and adult molts. The deer mice are most readily distinguished from hairless-1 by the absence of elongate claws.