. Biology and man. Biology; Human beings. Amerkmi Museum of Natural Uistory SEXUAL DIMORPHISM IN INSECTS The cabbage butterfly, the female having two spots on the front wing, in addition to the dark tip in place, in the absorbing of excess food which is normally passed on to the next generation. And there is almost uniformly a marked difference in size between the male structures—or even individuals—and the female, the female being generally the larger. Looked at from this point of view, maleness and femaleness seem to extend to many traits of plants and animals that are not directly connected
. Biology and man. Biology; Human beings. Amerkmi Museum of Natural Uistory SEXUAL DIMORPHISM IN INSECTS The cabbage butterfly, the female having two spots on the front wing, in addition to the dark tip in place, in the absorbing of excess food which is normally passed on to the next generation. And there is almost uniformly a marked difference in size between the male structures—or even individuals—and the female, the female being generally the larger. Looked at from this point of view, maleness and femaleness seem to extend to many traits of plants and animals that are not directly connected with reproduction. Secondary Sexual Characters We may see that in both plants and animals there are many characteristics which have nothing directly to do either with getting food and growing or with splitting off special reproductive cells—whether spores or gametes. In connection with producing and dis- charging eggs and sperms, some of these supplementary structures and proc- esses seem to get far away from the essentials. We speak of such organs and activities as secondary sexual characters. The differentiations between male and female individuals are most striking and elaborate in flying animals— birds and insects. We can understand these as being in a way related to the fact that the gametes have to be brought together in a fluid medium. But. Aiiicrican Museum of Natural Uistory SEXUAL DIMORPHISM IN CRUSTACEANS Female and male of the fiddler crab, Uca brevifrons 391. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965; Bingham, N. Eldred (Nelson Eldred), 1901-. Boston, New York, [etc. ] Ginn and company
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