Ill 



OBSERVATIONS AND DEDUCTIONS 



In order to facilitate future work, it will be well to set 

 down some observations from Mendel's experiments 

 together with a few simple deductions M^hich will be 

 found useful in the solution of problems and in shorten- 

 ing discussion. Some may seem very obvious, others 

 even trivial, but all will be found useful. 

 /" ( 1 ) If the original parents differ in n pairs of characters, 

 their hybrids' progeny consist of 2" groups, the numbers 

 in which are to each other in the ratio (3 : 1)", thus : 



/, 



3:3:1 



n 2'» (3 : 1)" 



(2) Conversely, if the hybrids' progeny consist of 

 2, 4, 8 ... 2" groups, the numbers in which are in 

 the ratio (3 : 1)", then the original parents differed 

 in n pairs of characters. 



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