9. Linkage of g₄ and thin kernels. In a cross of Inbred II x g₄ wx, three F₂ ears segregated 25% thin kernels and the other four F₂ ears were normal. Seed was taken from an ear segregating thin kernels, and the normal kernels planted separately from the thin ones. Theoretically, g₄ should have segregated 3:1 in each group, All 14 plants obtained from the kernels of normal thickness were green, while the 10 plants from the thin kernels were g₄. This behavior suggests that the gene (or small deficiency ?) for thin kernels is closely linked with g₄.