When does exon shuffling occur? a. during splicing of dna b. during mitotic recombination c. as an alternative splicing pattern in post-transcriptional processing d. as an alternative cleavage or modification post-translationally e. as the result of faulty dna repair?

The correct answer is C.

 Exon shuffling occurs as an alternative splicing pattern in post-transcriptional processing.

Exon shuffling is termed as a molecular mechanism which is formed of new genes. Two or more exons which are of different genes can be brought together ectopically.
 Exon shuffling can occur in cross over during sexual recombination of illegitimate recombination and parental genomes, transposon-mediated exon shuffling. Exon shuffling follows certain splice frame rules.

The higher you go up the less oxygen there is 

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