Properties of the sex chromosomes of Lucilia cuprina deduced from radiation studies |
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Authors: | R H Maddern D G Bedo |
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Institution: | (1) CSIRO Division of Entomology, G.P.O., Box 1700, 2601 Canberra, ACT, Australia |
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Abstract: | From a study of radiation-induced X-chromosome deletions the locus of black body (b) has been localized to the proximal portion of C-band defined euchromatin. Radiation produced mostly X-chromosome deletions rather than point mutations, total X or Y chromosome loss through breakage, or increased frequency of non-disjunction. Aberrant sex ratios obtained indicate that the X chromosome carries vital loci that were deleted with b
+ in many cases. The X/O karyotype produces fertile adult females with a characteristic phenotype which is also produced by X deletions. Sex chromosome non-disjunction to give X/O females and X/X/Y males is normally rare but is enhanced by the presence of chromosome rearrangements even when the X and Y are not involved. |
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