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Updated: May 8, 2025
According to T. H. Morgan, it is simply due to the fact that the determinants for such characters are situated in the sex-chromosome. Morgan, however, also states that a case of true sexual dimorphism arose as a mutation in his cultures of Drosphilia. The character was eosin colour in the eye instead of the red colour of the eye in the original fly.
In the female this was dark eosin colour, in the male yellowish eosin. But this case differs from the characters particularly under consideration here in two points: there is no suggestion that it was adaptive, or that it was influenced by hormones from the gonads.
The first of these which he mentions is that of eye colour, differing in the two sexes, in the female dark eosin, in the male yellowish eosin. Another mutation was a change of the third segment of the thorax into a segment similar to the second.
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