Answer: splicing

AnswerCrossword Clue
SPLICINGTying the knot
SPLICINGGene processing
splicingJoin (pieces of timber, film, or tape) at the ends
splicingthe act of joining at both ends
splicingJoin or insert (a gene or gene fragment)
splicingJoin or connect (a rope or ropes) by interweaving the strands