| Citation | Distinguished for his wide-ranging researches on the cytology, genetics and evolution of Drosophila melanogaster. He was the first to make a comprehensive map of puffs in the salivary gland polytene chromosomes and to define the stage at which each was expressed. He went on to demonstrate the effects of various stimuli, especially heat-shock and ecdysone, on puffing at specific loci, and correlated particular puffs with particular gene products. Combining genetic, cytological and molecular methodology, he has investigated in fine detail particular chromosome regions, especially that surrounding the Adh (alcohol dehydrogenase) gene, revealing many novel features of structure and function. He has also made important contributions to the understanding of evolution and speciation within the D.melanogaster group of species. Ashburner has unque standing as a scholar and authority in the whole area of Drosophila research. |