This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics, Subject name: Pathology
The gene that regulates normal morphogenesis during development is: 
Select and explain. 
A. FMR-1 gene, B. Homeobox gene, C. P-16, D. PTEN
B: Homeobox gene
Answer: B: Homeobox gene 
Explanation: HOX gene( Homeobox gene). Normal morphogenesis during development include Implicated in the patterning of limbs, veebrae, and craniofacial structures. Possess retinoic acid response elements(RAREs)- Required for mediating both physiologic and pathologic effects of retinoids Mutations of HOXD13 cause synpolydactylyin heterozygous individuals mutations of HOXA13 cause Hand-foot-genital syndrome,