1. Inheritance of chocolate colored pollen.

In a plant of the genetic constitution, li r^rr A₁A₂ B Pl, the pollen was of a chocolate color. Through self‑polliation strain with that pollen color was obtained.

Some crosses of these plants with plants of a constitution, Li r^rr A₁A₂ b Pl, and a yellow pollen plant were made. In the F₁ the pollen was of a light chocolate color. The chocolate color is due to a dominant factor for which we use the symbol Co.

The following relations of the phenotypes of the mentioned backcross were obtained:

(a)	a Pl Co	‑	178 chocolate pollen
	B Pl co	‑	169 yellow "
	B Pl Co	‑	180 " "
	B pl co	‑	173 " "
	B Pl Co	‑	167 chocolate "
	B Pl co	‑	171 yellow "
	b pl Co	‑	166 " "
	b pl co	‑	181 " "
	Total	1,385

(b)	Li Co	‑	698 chocolate pollen, green leaves
	Li co	-	127 yellow " , " "
	li Co	-	139 chocolate " , lineate "
	li co	-	719 yellow "
	Total	1,683

The chocolate pollen has developed only in plants with purple anthers. This means that there is an interaction of the factor for purple anthers and chocolate color.

A linkage of 15.8% exists between the factor for chocolate pollen and the factor for lineate leaves, located in chromosome 10.