Final answer:
Dominant negative disruption of signaling, as seen for the FGF receptor tyrosine kinases, is most likely to be found in mutations in tyrosine kinase genes, which can still interact with the wild-type protein but block some aspect of its function.
Step-by-step explanation:
Dominant negative disruption of signaling, as seen for the FGF receptor tyrosine kinases, would also be most likely to be found in mutations in tyrosine kinase genes that can still interact with the wild-type protein but block some aspect of its function. For example, in the case of the EGFR, a mutation in the transmembrane region that affects its ability to be stabilized by binding interactions during dimerization after ligand binding would lead to a dominant negative effect on EGF signaling. This would result in prolonged activation of the EGF signaling cascades within the cell.