INIIKRITANCE OF FECUNDITY IN DOMESTIC FOWE- 



347 



The case is a difficult one, because of the behavior of certain 

 of the daughters in subsequent matings. The most probable in- 

 terpretation of the facts is that $ 6i belonged to class 4, and 

 that D168 is a ? of class i. but that in certain of her daugh- 

 ters bearing L-2, this character did not come to full expression, 

 giving a winter record of under 30. Three of the 10 daughters 

 of 5 D168 recorded as 'Under 30' laid 25 or more eggs in the 

 winter period. If we suppose these to be really L2 birds, we 

 should then have the following gametic distribution of i68's 

 daughters. 



Winter Production . 



Observed 



Expected 



ver JO 



Under so 



Zero 



5 



7 



I 



4-5 



6.5 



2 



This is as close as could be expected. 



Female Dqo may be of either class 3 or 4. The data at hand 

 do not enable one to determine with certainty between these 

 possibilities. Female Di^/'s only daughter left no adult 9 

 ofi'spring, and therefore it is not possible to make any conjecture 

 as to her constitution, beyond the fact that she was probably not 

 of class I or 2. 



In the case of a mmiber of males the families of adult daugh- 

 ters obtained were so small in size as to make impossible any ac- 

 curate determination of the gametic constitution of the mothers 

 used. All of these cases are here grouped together in one table. 



TABLE 26 



Stiowing tlie results in respect to fecundity of daughters from pure 

 Barred Rock matings in zvhich the families were too small in size or 

 number to permit classification as to gametic constitution 





No. OF 9 9 Mated 



Daughters' Winter Production 



c? 











'. 



Over 30 



Under 30 



Zero 



60 



5 



6 



4 



1 



16 



2 



4 



1 







5 



2 



3 



1 







H 



14 



14 



11 



1 



527 



5 



4 



4 







565 



8 



5 



8 







551 



11 



9 



8 



1 



Totals 



47 ■ 



45 



37 



3 



