From this trunk, like a tower, rose an enormous tenfold ramification, the branches of which crossed and intercrossed, and forked and developed, […]1895, Jules Verne, Captain Antifer, page 134:
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Biology, Genetics, Medicine, Natural sciences, Sciences To breed two strains having a common ancestry with one another
A species varies occasionally in two directions, but owing to their free intercrossing they (the variations) never increase.1916, Alfred Russel Wallace, Letters and Reminiscences, Vol. 1:
Intercrosses are particularly useful with recessive mutations maintained in a small colony.2000, Xavier Montagutelli, “Determining the Genetic Basis of a New Trait”, in Sundberg & Boggess, editors, Systematic Approach to Evaluation of Mouse Mutations, →ISBN, page 20: