Crossword Genius

What may connect strings of recessive genetic material? (3)

Ross

I believe the answer is:

and

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for and that I've seen before include "moreover" , "it needs wholly positive input for positive result" , "It connects words, clauses or sentences" , "Together with" , "In addition" .)

I've seen this clue in The Telegraph.
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