• Gurbachan S Miglani

      Articles written in Proceedings – Animal Sciences

    • Statistical analysis of cryptic variation inDrosophila alcohol dehydrogenase

      Gurbachan S Miglani Franklin R Ampy

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      Statistical analysis indicated that mean alcohol dehydrogenase (ADH) activity levels within ADH1 and ADH11 isochromosomal lines varied significantly among the Mexican populations ofDrosophila melanogaster used. Also as indicated by coefficient of variation values for ADH activity, the relative amount of genetic variation differed among and within the ADH1 and ADH11 strains examined. The quantitative nature of the differences in ADH activity supported the concept of the additive gene action of the alcohol dehydrogenase (Adh) locus. The manner in which our isochromosomal lines were constructed suggested that genes regulating ADH activity inD. melanogaster were located on the second chromosomes.

    • Induction and genotypic verification of recombinants in males ofDrosophila melanogaster

      Gurbachan S Miglani Vindhya Mohindra

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      Ethyl methanesulphonate (0·75%) was mixed with food (1∶9) and fed to developing F1 (Oregon-K+/dumpy black cinnabar, dp b cn) individuals in second one-third part (54–86 h after egg deposition) of larval life, at 25±1°C, for inducing recombination in males ofDrosophila melanogaster. In control and 0·75% ethyl methanesulphonate experiments, pooled test cross progeny comprised 3475 and 13887 flies, respectively, out of which 9 and 236 were recombinants. From these, 9 and 192 recombinants were further test-crossed and 55·5% and 87·0% were verified, respectively. Non-reciprocal recombination was observed indp-b but not inb-cn region with 0·75% ethyl methanesulphonate as evidenced by high frequency of +b cn male recombinants over its complementary classdp ++. Majority of the +b cn male recombinants verified did not produce in their test cross progeny the two phenotypes (+b cn anddp b cn) in expected 1∶1 ratio contrary to +b cn female recombinants, suggesting influence of cytoplasm in transmission of recombinant (+b cn) phenotype from male.

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