80 pages matching evolution adaptation morgan in this book
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acquired characters adaptation adult amongst ancestors animals and plants appear archaeopteryx arisen artificial selection assume become believe birds breed caterpillars causes cells color conclusion connection crustaceans Darwin Darwinian degeneration degrees descent direction domestic eggs embryo environment evidence evolution existence experiments explain external fact females fertilized fish flowers fluctuating variations gemmules genus geotropic germ-cells give hybrid hypothesis important individuals insects instance instinct kind Lamarck Lamarckian large number later less light living males mammals ment mollusks mutation theory natural selection notochord offspring organs origin pangenesis parent form parthenogenetic polar body pollen present principle probable produced question race recapitulation theory regard relation reproduction resemblance response result rotifers secondary sexual seeds sexual selection shown side sort spermatozoon stages stamens sterility structure supposed takes place theory of natural tion transmutation theory variability varieties vertebrates Vries Weismann wings young zoea