Drosophila melanogaster is the fancy name for the common fruit fly (or vinegar fly), and Thomas Hunt Morgan of California Institute of Technology is the man who made Drosophila famous. For several decades Dr. Morgan, a Nobel Prizewinner, and his numerous co-workers charted the locations of genes on the fruit fly's chromosomes.
Chromosomes are visible, but no man can swear that he has ever seen a gene. High magnifications have shown distinct segments along the chromosome's length, but it is not certain whether these are bundles of genes, or whether the genes occupy spaces between the segments. It...
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