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X-linked, one-locus-two-allele model for caste determination in R. speratus under laboratory conditions [11]. Offspring with wkAB and wkAY genotypes develop into workers; offspring with genotypes wkAA and wkBY into nymphs. The genotype wkBB is lethal. Female nymphoids and ergatoids also produce female nymphs parthenogenetically (wkAA; not shown). The genotype matches phenotype in the absence of reproductives.
