In population biology, the process by which genes are transferred from one population to another by hybridization followed by backcrossing to the original population. Introgression is similar to migration, except that it is usually assumed that the gene transfer occurs between species. (This may also be a contradiction in terms depending on the species concept you use).
In`tro*gres"sion (?), n. [L. introgressus, p. p. of introgredi to go in; intro- within + gradi to step, go.]
The act of going in; entrance.
Blount.
© Webster 1913.
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