Figure 1.

Phenotypes of Flowers Harboring Different an1 Alleles.

(A) Flower of line W138, homozygous for the allele an1-W138.

(B) Flower of a plant heterozygous for an1-W138 and a full revertant An1⁺ allele.

(C) Flower of a plant heterozygous for an1-W138 (evident from the red spots) and an excision allele with partial activity (evident from the pink background color).

(D) Flower of a plant homozygous for a stable recessive null allele derived from an1-W138.

(E) Flower of a homozygote for an1-A2255, a stable allele with low activity.

(F) Flower of a homozygote for the unstable an1-X2191 allele.