The Law of Heredity: A Study of the Cause of Variation, and the Origin of Living OrganismsJ. Murphy, 1883 - 336ÆäÀÌÁö |
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17 ÆäÀÌÁö
... specializations of the organism have been produced . 8. Changed conditions do not act directly , but they cause subsequent generations to vary . 9. In the higher animals , where the sexes have History of the Theory of Heredity . 17.
... specializations of the organism have been produced . 8. Changed conditions do not act directly , but they cause subsequent generations to vary . 9. In the higher animals , where the sexes have History of the Theory of Heredity . 17.
18 ÆäÀÌÁö
... sexes have long been separated the male is more variable than the female . 10. The result of crossing is not the same when crosses are made reciprocally . 11. The sex of the parent - species affects the degree of variability of hybrids ...
... sexes have long been separated the male is more variable than the female . 10. The result of crossing is not the same when crosses are made reciprocally . 11. The sex of the parent - species affects the degree of variability of hybrids ...
56 ÆäÀÌÁö
... to males , and in still other cases to both sexes . In 1775 , Schäffer , of Regensburg , discovered its oc- currence in fresh - water crustacea , although Dr. Albrecht had made the same discovery in insects in 1701. Schäf- 56 Heredity .
... to males , and in still other cases to both sexes . In 1775 , Schäffer , of Regensburg , discovered its oc- currence in fresh - water crustacea , although Dr. Albrecht had made the same discovery in insects in 1701. Schäf- 56 Heredity .
62 ÆäÀÌÁö
... sexes . Dufur , Kessler , Hartig , Walsh , and many other nat- uralists have shown that certain female gall - wasps are parthenogenetic ; within recent years Bassett and Adler have made most interesting observations upon these wasps ...
... sexes . Dufur , Kessler , Hartig , Walsh , and many other nat- uralists have shown that certain female gall - wasps are parthenogenetic ; within recent years Bassett and Adler have made most interesting observations upon these wasps ...
63 ÆäÀÌÁö
... sexes are born . In all cases the parthenogenetic forms are so different from the sexual forms that they had previously been de- scribed as distinct species , and in most cases they had been placed in distinct genera . The following ...
... sexes are born . In all cases the parthenogenetic forms are so different from the sexual forms that they had previously been de- scribed as distinct species , and in most cases they had been placed in distinct genera . The following ...
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acquired action adult alike allied species ancestor ancestral form asexual asexual reproduction become birds body breed characteristics color common conclusion confined crossing crustacea Daphnia Darwin Darwin says descendants domesticated animals domesticated pigeons embryo epigenesis evolution existence experience explanation fact female fertilized fortuitous fowls functions furnishes gemmules genera genus germ germinative vesicle give rise gradually greatly hereditary homology horns hybrid hydroids hypothesis individual influence inherited insects latent male cell male element males of allied medusa ment modification natural selection offspring ordinary origin origin of species ovum pangenesis parent parthenogenesis peculiarities perfect phenomena plants plastidules plumage present produced pure race reasons for believing reciprocal crosses reproductive elements resemblance result secondary sexual characters sexes sexual elements sexual reproduction sexual selection similar simply striped structure tendency to vary theory of heredity throw off gemmules tion transmission transmit true variable various young