Q. Assertion In recombinant DNA technology, human genes are often transferred into bacteria (prokaryotes) or yeast (eukaryote).
Reason Both bacteria and yeast multiply very fast to form huge population, which express the desired gene.

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Solution:

Recombinant DNA is the DNA whose nucleotide sequence has undergone alteration as a result of incorporation or exchange with another DNA strand. In recombinant DNA technology, human genes are often transferred into bacteria or yeast because both bacteria and yeast multiply very fast to form huge population, which express the desired gene. So, both assertion and reason are true and reason is the correct explanation of assertion.