The Evolution of SexW. Scott, 1889 - 322 pages |
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Common terms and phrases
active adult amoeboid amphibians anabolic anabolism and katabolism asexual asexual reproduction associated become birds body buds carpels cell-division chromatin ciliated colony colour conjugation continuous contrast crustaceans Darwin degenerate dichogamy differentiation division drones ducts Düsing egg-cell eggs embryo emphasised epigenesis essential evolution extrusion fact favour female cells female organs fertilisation fishes flowers frog functions germ-plasma germinal vesicle growth Hensen heredity hermaphroditism Hertwig higher animals hydroid illustrations important individual influence infusorians insects larvæ less male and female male elements mammals mature medusoid multiplication natural selection normal nuclear nucleus nutritive observed occur offspring origin ovary ovum parasitic parent parthenogenesis passive physiological plants polar globules predominant preponderance primitive produce protoplasm Protozoa recognised regard reproductive cells reproductive elements reproductive organs result Rolph rotifers secondary sexual characters sex-cells sexual reproduction sexual selection species sperm spermatozoa sponges stage structure theory threadworm tion union unisexual usually variations vegetative Weismann yolk