The Law of Heredity: A Study of the Cause of Variation, and the Origin of Living OrganismsJ. Murphy, 1883 - 336페이지 |
도서 본문에서
32개의 결과 중 1 - 5개
20 페이지
... male element a perfect but minute organism , and that the subsequent development of the egg is simply the " evolution " or unfolding of this germ . Up to the end of the last century the prevailing opinion was that each egg contains , in ...
... male element a perfect but minute organism , and that the subsequent development of the egg is simply the " evolution " or unfolding of this germ . Up to the end of the last century the prevailing opinion was that each egg contains , in ...
21 페이지
... male element , and to receive from the egg the nourishment needed for its growth and perfect development . Loeuwenhoeck's discovery of the motile spermatozoa of animals was regarded as a new basis for this view , and the " sperm ...
... male element , and to receive from the egg the nourishment needed for its growth and perfect development . Loeuwenhoeck's discovery of the motile spermatozoa of animals was regarded as a new basis for this view , and the " sperm ...
49 페이지
... male sex- ual element can act not solely on the ovule , but occa- sionally on the mother form ; how a limb can be repro- duced on the exact line of amputation , with neither too much nor too little added ; how the various forms of ...
... male sex- ual element can act not solely on the ovule , but occa- sionally on the mother form ; how a limb can be repro- duced on the exact line of amputation , with neither too much nor too little added ; how the various forms of ...
70 페이지
... male cell . The ripe ovarian ovum of an animal usually contains a ... male pronucleus , " which unites with the " male pronu- cleus " formed from the male cell after impregnation , and thus builds ... element originally contains 70 Heredity .
... male cell . The ripe ovarian ovum of an animal usually contains a ... male pronucleus , " which unites with the " male pronu- cleus " formed from the male cell after impregnation , and thus builds ... element originally contains 70 Heredity .
71 페이지
... element originally contains a male portion and a female portion ; the ripe male cell is the male half of the male element , and the " polar globules " contain the male substance of the ovum , which is discharged in order that it may be ...
... element originally contains a male portion and a female portion ; the ripe male cell is the male half of the male element , and the " polar globules " contain the male substance of the ovum , which is discharged in order that it may be ...
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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