

White Waltzing Mouse, a 

 Japanese variety, given to spin- 

 ning round as if after its tail; no 

 pigment except small patches 

 of fawn. 



White Mouse, an albino variety 

 of the House Mouse, without pig- 

 ment in hair or eye; locomotion 

 normal. 



If pure-bred forms of the above 



cross the offspring are largely 

 grey, with black eyes and normal 



If these hybrids pair the offspring are varied. 



vjiuuy v_, 25 per cent, have pink eyes, 

 but are fawn, lilac. o>- piebalds of white 

 with fawn or lilac. Rather less than a 

 fifth of the total number (A, B. and C) 

 are waltzers. Colour and waltzing are 

 independently transmitted. 



Group B, 50 per cent. 



la 



Group A, 

 are albinos. 



have black eyes and are 

 grey, or black, or black 

 and grey piebald. 



Members of Group A 

 mated together produce 

 only albinos like them- 

 selves. 



Members of Group B mated together produce greys 

 only like (3), or a mixed litter of albinos, greys, fawns, 

 and piebalds of these. 



Photo: British Museum (Natural History), 



Members of Group C 

 mated together produce 

 fawns, lilacs, piebalds of 

 these, and an occasional 

 albino. 



MENDELISM IN MICE 



