BIPARENTAL MALES AND BIPARENTAL RATIOS IN HABROBRACON

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Abstract
The conclusion that biparental males in H. juglandis are produced only by parents from related stocks is further confirmed. Selection with brother-sister matings increased the % of matings producing biparental [male][male] from 8% in the 1st generation to about 100% in the 17th and 19th. No progress was made after the 19th, and tests showed the strain to be homozygous for factors regulating [male] biparentalism. Three grading experiments, each begun by crossing unrelated stocks and carried out by grading each line to one of its parental stocks, showed an increase both in the proportion of matings producing biparental oo and in the proportion of such [male][male] among the total biparental offspring, and indicated further a genetic basis for production of biparental [male][male] Differences in the proportion of [male][male] among biparentals, the values for the last group of matings in each experiment being 12%, 21%, and 24%, respectively, indicated differences in the residual heredity of wild-type stocks used. Fraternities containing biparental [male][male] consistently had a lower proportion of biparental offspring ([male][male] and [female][female]), suggesting early lethality of some individuals developing from fertilized eggs. Results are in full agreement with the theory of sex-determination proposed by P. W. Whiting.

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