The number, length, and arrangement of testioles resemble entirely of those dissected from diploid males C. Drosophila doublesex gene controls somatic sexual differentiation by producing alternatively spliced mRNAs encoding related sex-specific polypeptides.
Systems of caste determination in the Apinae, Meliponinae and Bombinae and their phylogenetical implications.
Dzierzon's key observation was that a virgin queen that has not taken a mating flight queens mate only while in free flight away from nest produces only male progeny. Two alleles are envisaged. Arch Zellforsch.
Fem activity is not achieved by heterozygosity. Fem activity is also required to maintain the female determined pathway throughout development, which we show by mosaic structures in fem -repressed intersexuals. The observation of the male variant of fem and Am-dsx mRNAs in the repression experiments implies that the female pathway is actively regulated and Csd protein directs splicing in femand Fem protein directs splicing in Am-dsx female mRNAs.
A, et al. Bees heterozygous at Sex Determination Locus are females, whereas bees homozygous or hemizygous are males. M, Gibbs R.
Inactive CSD proteins, when derived from homo- or hemizygous csd alleles, result in a splicing of the fem and dsx transcripts, which is the default male state fem M , Am-dsx M. The tibia and the first tarsus of sexually transformed female hind legs have a male-like shape Fig 3O and lack the female-specific structures such as the pollen basket unpublished , the pollen comb, and the pollen brush, which is composed of symmetrically arranged rows of bristles see the hind leg of an untreated female Figure 3M for a comparison.
Die Drohneneier sind nicht befruchtet. I saw a male of M.