Table 2.

Phenotype of F2 generation mice.

F1 generation parental composition (♂ × ♀)	Mating method	Number of hairless phenotypes of F2 generation	Number of normal phenotypes of F2 generation	Phenotype separation ratio (hairless: normal)
HL (HL × HL) × NIH (HL × NIH)	Test cross	41	45	0.95
HL (HL × HL) × NIH (NIH × HL)	Test cross	37	49
NIH (HL × NIH) × HL (HL × HL)	Test cross + negative crossing	24	19
NIH (NIH × HL) × HL (HL × HL)	Test cross + negative crossing	42	38
NIH (NIH × HL) × NIH (NIH × NIH)	–	0	20	0
NIH (NIH × HL) × NIH (NIH × HL)	Self-cross	17	62	0.29
NIH (HL × NIH) × NIH (HL × NIH)	Self-cross + negative crossing	24	80