562 GENETICS IN RELATION TO AGRICULTURE 
It is difficult to present briefly all the evidence which has led Pearl 
to advance the foregoing analysis for the data on fecundity in fowls, 
reference must be made to the complete published results dealing with 
these experiments. In Table LX XVIII the data are summarized and com- 
pared with expectations, 
Tapte LXXVI.—Generic Consrirutions or but not in a satisfactory 
Cornisa InpIAN GAME MALES FOR manner, because different 
SEL SS types of matings have been 
Class Genetic constitutions | Gametcs produced lumped together. It does, 
ae however, show as well as 
1 (Zm)(Zm) LL (Zm)L can be shown in so short 
2 (Zm)(Zm) Ll (Zm)L, (Zm)l a summary, how closely 
g l : 
: | euerOn Ge fecundity conforms to the 
requirements of a Men- 
delian analysis. There can be little doubt that Pearl has laid the 
broad foundations for a more definite knowledge of the behavior in 
heredity of a complex character of great economic importance. The 
practical implications of this analysis are discussed in Chapter XX XVIII. 
Taste LX XVII.—Genetic Constitutions or CornisH INDIAN GAME FEMALES FOR 
Frecunpity Factors 
Class | Genetic constitutions | Z cametes | W gametes | Winter egg production 
eens Se meee — — es — SS 
1 | (Zm) WLL | (Zm)L WL | Under 30 eggs 
2 (Zm) WL | (Zm)L, (Zmjl | WL, Wl Under 30 eggs 
3 | (Zm) Wil | (Zmyjl Wl | No eggs 
Tastes LX XVIII.—Osservep anp Exprcrep DistrisuTions or WINTER EaeG Pro- 
DUCTION For ALL Matinas IN PEARL’s EXPERIMENTS 
Winter production of daughters 
Mating Class i 
Over 30 | Under 30 None 
eat =. pull eS ane ae RA 
Barred Plymouth Rock......... | Observed 365.5 | 259.5 31.0 
Expected | 381.45 | 257.25 | ine 
Cornish Indian Game..... ....| Observed | 220) 23.0 1520 
Expected | 0.0 | 25.0 15.0 
PALE eee ton eee ee en Observed 36.0 79.0 8.0 
Expected | 26.5 88.75 9.75 
All F; and back-crosses........ Observed | Sed 98.5 | 231.0 
Expected | 68.6 | 95.0 15.4 
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