Final answer:
The failure to synthesize necessary proteins during the G1 phase of the cell cycle typically causes a multicellular individual to develop a type of cancer due to disrupted cell regulation and potentially uncontrollable cell division.
Step-by-step explanation:
A disruption of the cell cycle during the Gap 1 (G1 phase) can affect a cell's ability to carry out normal functions due to a failure in synthesizing necessary proteins. This can prevent the cell from producing proteins required for its own growth and DNA replication that is crucial for cell division. The typical result of such disruption could be a failure to progress to the S phase, leading to cellular arrest or even premature cellular aging known as senescence. However, if certain checkpoint mechanisms fail, the disrupted regulation could lead to uncontrollable cell division, a condition often associated with the development of cancer. Therefore, the correct answer to the question is that the disruption during the G1 phase typically causes a multicellular individual to develop a type of cancer.