Evidence for Random Association between Enzyme Loci in Natural Populations and their Mass Culture Stocks of Drosophila ananassae

Objective: The major objective of this study was to see that enzyme loci located on the same chromosome (intra chromosomal) or different chromosomes (interchromosomal) exist in equilibrium or not. Material and methods: In gel analysis was performed following native gel electrophoresis to collect data regarding presence of specific enzyme variants. Based on quantitative data on the frequency of different allozyme combinations, intra- and inter-chromosomal associations between such enzyme loci were studied, in natural populations as well as their mass culture stocks of D. ananassae. Results: In natural populations of this species, out of 195 allozyme loci comparisons, non-random associations among different genotypic combinations existed in only four comparisons (2.05%), indicating that these enzyme loci exist in equilibrium. Almost similar results were observed for mass culture stocks, except that the nonrandom cases in mass culture socks were slightly higher (6.67%). Conclusion: The results of this investigation clearly denote that intra- and inter-chromosomal associations between different enzyme loci exist in linkage equilibrium in natural populations as well as in mass culture stocks of D. ananassae. The most probable reason for this random association is due to substantial amount of crossing over between the linked enzyme loci and reasonable survival of all possible combinations.

Author(s): Sanjay Kumar, Arvind Kumar Singh and Shailesh Singh

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