 That is, one-day-old chicks with primary remiges shorter than coverlets carry the "K" gene of sex-linked delayed-feathering (see Figure 2C).Contrary to multifactorial slow-feathering genes, which affect only chicks carrying "K", the autosomal recessive alleles "t" ("tardy") and "t"s ("retarded") of the "T" allelic series affect only those chicks of the fast normal-feathering type.The dominance order is "T" (normal) > "t"s ("retarded") > "t" ("tardy").