The Variation of Animals and Plants Under Domestication

Charles Darwin's work, The Variation of Animals and Plants Under Domestication (1868), explored the causes of variation in domestic breeds. Darwin marshaled facts to show how fanciers selected from naturally occurring variations to produce specific traits in animals like pigeons. This work aimed to answer critics who questioned his theory of natural selection, particularly the idea of a blind, accidental process of variation.1

Darwin also proposed a theory of "pangenesis" to explain how traits were inherited, suggesting that "gemmules" from all body tissues contributed to offspring. However, this hypothesis was later dismissed when experiments failed to find evidence for gemmules. Darwin's broader theory of evolution by natural selection, first published in On the Origin of Species (1859), proposed that species with beneficial adaptations are more likely to survive and reproduce, increasing the frequency of those adaptations over generations.2134