86 A MANUAL OF MENDELISM 



and the chances are equal that either the grey factor 

 in the grey parent or the recessive factor, whichever 

 it may happen to be, should combine with either factor 

 in the other parent. Thus half the progeny should be 

 grey and half of other colours. 



„ Other 



Greys , 



■' colours 



In 288 early Thoroughbred matings the 



progeny consisted of . . . 140 144 



In 125 Shire matings the progeny were 64 81 



(iv) While half the foals of a hybrid grey sire with 

 mares of other colours should be grey and the other 

 half of other colours, no foal should carry a colour 

 lower in the scale than the recessive carried by the 

 grey sire. In grey sires containing bay, for instance, 

 the bay factor should combine with the bay or black or 

 chestnut factor in the dams, but, as black and chestnut 

 are recessive to bay, the foals carrying black or chest- 

 nut along with bay should be bays. Similarly, grey 

 sires carrying black should leave no foals lower in the 



