A scientist discovered a new factor, Sneezy, to be important for the central nervous system development. This factor is concentrated at the posterior end of the neural tube during development. If a mutation inactivates the activity of Sneezy, which phenotype below would the most likely result of this mutation? Smaller brain with longer spinal cord. Fused brain hemispheres and overdeveloped spinal cord. Larger brain with shorter spinal cord. Underdeveloped brain and underdeveloped spinal cord. Overdeveloped brain and overdeveloped spional cord.

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