SIMILAR EFFECTS 115 



The Parents The Hybrids' Progeny Ratio 



Red White 



0401 red x 0705 white 31 9 3-4:1 



0203 „ X 0705 „ 72 28 2-6 : 1 



0235 „ X 0470 „ a 32 6 5-3 : 1 



b 67 18 5-2 : 1 



c 63 15 4-2 : 1 



In his next experiments, however, the results were very 

 different indeed, and indicated either that there were 

 hybrid reds which bred true indefinitely — if that were 

 possible — or that there were so many more pairs of 

 factors with dominants producing red and recessives 

 producing white that a very great number of plants 

 must be bred from before a recessive white could appear. 

 The following are the figures : 



The first six of these experiments suggest a very wide 

 ratio and many factors, while the last suggests three 

 pairs of factors : three producing red and their reces- 

 sives producing white. To settle the question the 

 whole 78 lots in the first experiment (a) were sown 

 and so a third hybrid generation was produced. We 



