A mouse line that lacks a specific gene in order to study the effects of the absence of said gene is called called a(n)________.

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A knockout mouse line is specifically designed to lack a specific gene in order to study the effects of its absence. Transgenic mice have foreign genes introduced into their genome, chimera mice have cells from different embryos combined to make one organism, clones are genetically identical copies of an individual, and mosaic mice have different genotypes within their body.

A Mouse Line That Lacks a Specific Gene in Order