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The mo (hereditary mosaic) mutation is one of the most famous and interesting mutations of the silkworm, Bombyx mori. Females homozygous for mo generate mosaic and gynandromorphic offspring due to non-elimination of polar bodies and subsequent double fertilization events, irrespective of the genotype of the mated males. Although mo was first reported in 1927, the locus has not been mapped to linkage...
The W chromosome of the silkworm Bombyxmori is devoid of functional genes, except for the putative female-determining gene (Fem). To localize Fem, we investigated the presence of W-specific DNA markers on strains in which an autosomal fragment containing dominant marker genes was attached to the W chromosome. We produced new W-chromosomal fragments from the existing Zebra-W strain (T(W;3)Ze chromosome)...
In deletion-mapping of W-specific RAPD (W-RAPD) markers and putative female determinant gene (Fem), we used X-ray irradiation to break the translocation-carrying W chromosome (WZe). We succeeded in obtaining a fragment of the WZe chromosome designated as ZeW, having 3 of 12 W-RAPD markers (W-Bonsai, W-Yukemuri-S, W-Yukemuri-L). Inheritance of the ZeW fragment by males indicates that it does...
Bombyx mori is a female-heterogametic organism (female, ZW; male, ZZ) that appears to have a putative feminizing gene (Fem) on the W chromosome. The paternally transmitted mutant W chromosome, Df(pSa + pW + od)Fem, derived from the translocation-carrying W chromosome (pSa + pW + od), is inert as femaleness determinant. Moreover, this Df(pSa + pW + od)Fem chromosome has been thought...
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