SUPPRESSED EFFECTS 



An early example of the suppression of the effect of 

 one factor by that of another is to be found in Mr. 

 Hurst's experiments on rabbits which were quoted from 

 in the last chapter. 



Belgian rabbits, whose colour is given as " yellow- 

 grey," were crossed with albinos, and all but one of the 

 seventy hybrids produced were ordinary wild greys. 

 The exception " had, when young, more yellow on the 

 chest and flanks than the others ; but after the second 

 moult it became almost wild grey like the rest." The 

 parents crossed and the hybrids produced are given in 

 the following table : 



From the hybrid generation two pairs of factors can 

 be inferred. In one pair, a factor which produces the 



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