216 



EAYMOND PEARL 



TABLE 25 



Showing the results of all matings of class ^ cf cf X all classes of 9 9 



It is clear that the four class 2 males produced a progeny gener- 

 ation, which, though relatively small in absolute numbers, agrees 

 very closely in respect to its gametic distribution with the ex- 

 pected results. 



Matings of a Barred Plymouth Rock male of class 8. Males of 

 class 8 are homozygous with respect to the absence of the first 

 production factor, and heterozygous for the second, their gametic 

 formula being fliL^ . flik. But one bird of this type was used in 

 the experiments. 



B.P.R. d" 26. Indicated constitution = fliLi . fhU. 



This was one of the original stock in 1908. Nothing further is 

 known of his breeding than that he was the son of a bird that had 

 laid 200 or more eggs in her pullet year. His dam must have been 

 of class 1, since a class 2 9 could not produce a class 8 cf. Male 

 26 was bred as a cockerel in 1908 with the following results: 



Matings: A. With 2 9 9 indicated to be of class 1 = /L1L2 . //1/2. 



9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 2| 9| 5 



Expected 4-^5 8.5 4-^5 



Mean winter production of all 



9 9 in indicated class 35.00 eggs 9. 89 eggs eggs 



