Heredity and sex . Fig. 54. — Male to left with horns and female to right without horns of afly, Elaphomyia. (After Wood.) females. The males of certain beetles have horns —the female lacks them (Fig. 52). In a genus of flies the eyes are stalked, and the SECONDARY SEXUAL CHARACTERS 107 eyes of the male have stalks longer than those ofthe female (Fig. 53). In another genus of flies thereare horns on the head like the antlers of the stag(Fig. 54). In the spiders the adult males are sometimes verysmall in comparison with the females (Fig. 55). Thesize difference may be regarded as a secondary se
Heredity and sex . Fig. 54. — Male to left with horns and female to right without horns of afly, Elaphomyia. (After Wood.) females. The males of certain beetles have horns —the female lacks them (Fig. 52). In a genus of flies the eyes are stalked, and the SECONDARY SEXUAL CHARACTERS 107 eyes of the male have stalks longer than those ofthe female (Fig. 53). In another genus of flies thereare horns on the head like the antlers of the stag(Fig. 54). In the spiders the adult males are sometimes verysmall in comparison with the females (Fig. 55). Thesize difference may be regarded as a secondary sexual
Size: 1535px × 1627px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectsex, bookyear1913
