OEB 53 Chapter Notes -List Of Domesticated Animals, Selective Breeding, Wild Type
17 Feb 2014
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The origin of the species: chapter 1 (variation under domestication) Darwin postulates that variation originates with male and female reproductive elements being affected in some unknown way before offspring are produced. He then suggests that most variation is heritable, with the idea of like producing like clearly exhibited by breeders. He also uses the example of rare traits such as albinism appearing in a child of an affected parent as evidence for the high probability that all types of variation are heritable. Perhaps the correct way of viewing the whole subject, would be, to look at the inheritance of every character whatever as the rule, and non- inheritance as the anomaly. Darwin spends a significant proportion of chapter 1 discussing pigeons. Darwin first refutes the alternative hypothesis that existing pigeon varieties are all descended from a like number of wild progenitor species.
