Indian Journal of Scientific Research

Crossing over is a well documented genetic phenomenon reported to occur in sexually reproducing organisms. Through this process new combinations of genes are produced that form raw materials for evolution. The event of crossing over is programmed to happen in prophase-I of meiosis that is accomplished in the presence of dozens of proteins appearing in cascade manner. Any discrepancy in the execution of this event may be due to lack of certain protein/s indicating it to be completely under the genetic control. As a general concept, it is known that heterogametic sex shows less frequency of crossing over than homogametic sex. Genus Drosophila, a well esteemed model organism has been considered to study this event and it has been found that spontaneous male meiotic crossing over does not occur in this genus. A brief explanation is being provided through this article describing the species which show substantial amount of spontaneous male meiotic recombination.