Heredity and sex . Fig. 65.—Papilio turnus ; female (above) and male (below), and the varietyP. turnus glaucus (above, right) which appears only in the female. to do with the matter. It is well known that in Lepidop-tera the modified form commonly belongs to the femalesex. In one case (Abraxas grossulariata) it is knownthat the aberrant female type appears sporadically, as asport, and follows Mendels law of segregation. Punnettshows how the recurrence of the single type of male andthe three types of females of polytes may also be ac-counted for by the recognised methods of Mendelian in-heritan
Heredity and sex . Fig. 65.—Papilio turnus ; female (above) and male (below), and the varietyP. turnus glaucus (above, right) which appears only in the female. to do with the matter. It is well known that in Lepidop-tera the modified form commonly belongs to the femalesex. In one case (Abraxas grossulariata) it is knownthat the aberrant female type appears sporadically, as asport, and follows Mendels law of segregation. Punnettshows how the recurrence of the single type of male andthe three types of females of polytes may also be ac-counted for by the recognised methods of Mendelian in-heritance. He points out that by the assumption that SECONDARY SEXUAL CHARACTERS 129 these types have suddenly appeared as mutants manyof the difficulties of the older theories are avoided,and that such an assumption is in harmony withan ever increasing body of evidence concerningvariation and heredity. On this view natural se-lection plays no part in the formation of thesepolymorphic forms, nor does sexual selection. T
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectsex, bookyear1913
