Constitution of the White Leghorn Breed. 



207 



r C2B2/2/2 (1), white 



C^B^hli (2), white 



CcB2f2l2 (2), white 



CcB2f2li (4), white 

 99 \ C2B2/2/2 (1), white 



C2B2f2li (2), white 



C2B2f2i2 (1), white 



C25 2/212 (1), barred 

 I CcB 2/212 (2), barred 



The data given above may be summarized in the following table : 



It is thus apparent that among every 32 F2 individuals, one would 

 expect to obtain 6 barred birds, equally divided between the sexes. 

 The results may now be compared with the expectations as follows: 



These results appear to justify the view that either the W. L. d^ 

 or the W. P. R. 99 must be homozygous for the factor for black 

 pigmentation. Since we know that whenever black pigmentation is 



