The Evolution of Sex, Volumes 1-2Humboldt, 1890 |
Contents
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Common terms and phrases
active alternation amoeboid anabolic anabolism and katabolism aphides asexual reproduction become birds body buds cell-division cell-substance chromatin chromatin elements ciliated colony conjugation continuous contrast crustaceans Darwin degenerate differentiation division ducts egg-cell eggs embryo emphasized essential evolution expression extrusion fact favorable female cells female organs fertilization flowers function germ-plasma germinal vesicle growth habit Hensen heredity hermaphroditism Hertwig higher animals hydroid illustrations important increase individual infusorians insects larvæ less male and female male elements male organs mammals maturity Maupas medusoid multiplication natural selection naturalists normal nuclear elements nucleus nutritive observed occur offspring origin ovary ovum parasitic parent parthenogenesis passive physiological plants polar body polar globules predominant preponderance primitive produce protoplasm Protozoa regard repro reproductive cells reproductive elements reproductive organs result Rolph rotifers sex-cells sexual reproduction sexual selection species sperm spermatozoa sponges stage structure theory threadworm tion unisexual usually variations vegetative Weismann yelk