248 LOTSY AND KUIPER, A PRELIM. STATEMENT OF THE RESULTS OF MR. 
presence of but a single dose of I that the F, birds, although blackreds, 
were lighter in color than the bankantams and that some of the hens 
showed the influence of the silverfactor. Such F, hybrids can conse- 
quently give four kinds of gametes: SI, Si, sI and si and will form the 
following 16 combinations: 


Of these F, animals only those which posses at least one dose of S and 
lack the factor I will exhibit the silver colour e. g.in our case will be 
duckwings. | 
Of such there are three in every sixteen F, animals, one of which (the 
arched one on the checkerboard) will be homozygous for S, while the 
other two (the crossed ones on the checkerboard) will be heterozygous 
OE Se 
The next generation therefore may throw light on the question 
whether our F, duckwings were homozygous or heterozygous for S. 
The F3 generation 
The scheme on p. 241 shows, that a F, generation could be raised from 
the descendants of the Sonnerat cock 269.1, and from the progeny of 
the Sonnerat cock 195.1; we shall first consider the latter. 
The F, animals obtained from him had the following ascendency : 
BONDS 2622168 

F, 270.4 9 X 270.2 8 
150 RRS EEE 276:12 2276, DIE Kea OS 
blackred | blackred silvery | blackred | silvery 


F, 607 573 574 
