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Answer: introgression
Answer	Crossword Clue
introgression	the modification of species by the backcrossing of the hybrids with the parent species
introgression	The transfer of genetic information from one species to another as a result of hybridization between them and repeated backcrossing

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.

Answer: introgression