Abstract
THE testis of the newly hatched larva of wild-type Drosophila contains only spermatogonia which give rise to primary spermatocytes at the beginning of the second larval instar1,2. The primary spermatocytes which represent the early prophase of the first meiotic division have bigger nuclei and are larger in size and lie in the posterior end of the testis. This stage in the differentiation of the testis remains unchanged throughout the rest of the larval life. More advanced stages begin to appear after the formation of the puparium, so that 20-hr, old pupae contain fully mature sperms.
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