I9I5 Inheritance of Length of Pod in Certain Crosses 



415 



Table VII. — Frequency arrays of the average length of ripe pods of the third- generation 

 Lyon bean X Florida velvet bean {classes of 3 mm.) 



[The asterisk (*) indicates the pod length of the parent of the family] 



In length of pods, VL-319 and IvV-113 are the two lowest families 

 from long-podded parents. The family of VIv-319 ranges from 76 to 

 88 mm. and seems homozygous for E; that of LV-113 ranges from 76 

 to 85 mm., and throws short-podded, ranging from 49 to 58 mm. The 

 parental lengths were 82 and 79 mm., respectively. To all appearances 

 these two families are homozygous recessives for minor factors (regarded 

 as positive). 



VIv-480 and VIy-85 are the two highest families with the highest aver- 

 ages. (VL-297 was a nearly normal black plant throwing velvet.) The 

 family of VL-480 ranges from 97 to 112 mm. and is homozygous for E. 

 VL-85 ranges from 88 or 94 to 112 and throws short-podded of 70 to 

 73 mm. long. The parental lengths were 113 and 106 mm., respectively. 

 VL-480, as shown in the fourth generation, is apparently homozygous 

 for all minor factors, as well as for E. 



Thus, both near the minimum and near the maximum of the second- 

 generation long-podded plants, we find plants homozygous and heterozy- 

 gous for E. Hence, E is probably completely dominant. 



The numbers in each family are not large enough to determine the sepa- 

 rate ranges. The fifth and last lines of Table V show the pod lengths of 

 the parents of these families. The correlation between the average pod 

 lengths of the long-podded parents and the averages of the long-podded 

 plants of their progenies is 82 ±5 per cent for 36 third-generation families. 



The range of the short-podded plants in the various families is from 49 

 or 52 to 73 mm., and that of the long-podded from 73 to 118 mm. in the 

 elimination field (omitting the black plant, VL-297) and from 76 to 115 



