The Origin of Species

Charles Darwin

Editore: Forgotten Books
Formato: PDF
Testo in en
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Compatibilità: Tutti i dispositivi (eccetto Kindle) Scopri di più
Dimensioni: 12,63 MB
  • EAN: 9780259613114
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Descrizione

Distinction between the sterility of first crosses and of hybrids Sterility various in degree, not universal, affected by close in terbreeding, removed by domestication — Laws governing the sterility of hybrids — Sterility not a special endowment, but incidental on other difierences, not accumulated by natural selection — Causes of the sterility of first crosses and of hybrids — Parallelism between the effects of changed conditions of life and of crossing — Dimorphism and trimorphism — Fertility of varieties when crossed and of their mongrel ofispring not uni versal — Hybrids and mongrels compared independently of their fertility — Summary.