BRISTLE INHERITANCE IN DROSOPHILA 



439 



<5 2 — 5 — Z — S — S — 7 



GRADES OF PARENTS 



9 C \ 2 3 4 5 6 7 8 9 Fu 



GRADES OF PARENTS 



Fig. 4, See legend for fig. 2. Formulae for regression lines in table 5 



