CLAVATA1 (CLV1) is a receptor kinase that limits stem cell number and differentiation in the shoot and flower meristems of Arabidopsis plants by restricting expression of the transcription factor WUSCHEL (WUS). You mutate the intracellular serine residues in the receptor. What would you expect as a result of this mutation?

The mutation would increase stem cell number because inactive CLV1 would allow the overexpression of the WUS gene (by lack of phosphorylation)  

Explanation:

Protein phosphorylation is one of the most common types of posttranslational modifications and it occurs in tyrosine, serine, and threonine amino acids. This protein modification is well known to regulate cell cycle

the answer is golgi apparatus