Monogenic theory of handedness and lateralization results as having "hammered a nail in the coffin" because it was demonstrated that observed relationships between handedness and language lateralization did not involve genetic overlap. In other words, evidence goes to show that one single gene does not dictate handedness nor the part of the brain that one processes language with.
Article by The Scientist here.
Original published study on the The Journal of Neuroscience here.
Reference: The Journal of Neuroscience, 10 June 2015, 35(23): 8730-8736; doi: 10.1523/JNEUROSCI.3287-14.2015
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