As your lab is working on positional cloning, the next step in the project will be to

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The next step in positional cloning would be to develop a technique for replacing the gene that seems to be a causal factor in the depressive behavior. This is because positional cloning involves identifying a genomic region that is associated with a phenotype and narrowing down the region to identify the specific gene(s) responsible for the phenotype. Once the gene is identified, a technique for replacing or altering the gene can be developed to test whether it is indeed responsible for the phenotype. The other choices mentioned in the question do not directly relate to the process of positional cloning.

As Your Lab Is Working on Positional Cloning, the Next