T219H and Tl35, two of the more vigorous chlorophyll-deficient types in the Genetic Type Collection, both have distinctly light green foliage through-out their life cycle. They are controlled by different genes since the Tl35 phenotype is caused by a homozygote, y9y9 (Probst, 1950), and the T219H phenotype by a heterozygote, Y11Y11 (Y11Y11 has a bright orange-yellow seedling-lethal phenotype) (Weber and Weiss, 1959). However, because of the similar phenotypes, it has been suggested that y9 and y11 may be multiple alleles at the same locus.
Bernard, R. L.; Palmer, Reid G.; and Giles, B. P.
"Research Notes : Genes y9 and y11 for similar chlorophyll deficiencies prove to be non-allelic,"
Soybean Genetics Newsletter: Vol. 10
, Article 15.
Available at: http://lib.dr.iastate.edu/soybeangenetics/vol10/iss1/15