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Answer for the clue "Exchange of gene material between chromosomes; traversal ", 13 letters:
crossing over

Word definitions for crossing over in dictionaries

WordNet Word definitions in WordNet
n. the interchange of sections between pairing homologous chromosomes during the prophase of meiosis [syn: crossover ]

Wikipedia Word definitions in Wikipedia
Crossing Over is a 2009 American independent crime drama film about illegal immigrants of different nationalities struggling to achieve legal status in Los Angeles , and stars Harrison Ford as an immigration officer. The film deals with the border, document ...

Wiktionary Word definitions in Wiktionary
vb. (present participle of cross over English)

Usage examples of crossing over.

He told how, crossing over our blue western wall into a valley beyond, they found a “.

A cloud of gulls swirled about it constantly, and often Davos thought of crossing over to raid their nests.

Then came Trenton and a final ferry crossing over the Delaware to Pennsylvania.