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
Gene responsible for embryogenesis of eye 
Select and explain. 
A. PAX 6, B. PAX 2, C. PAX 5, D. RAX
A: PAX 6
Answer: A: PAX 6 
Explanation: Ans. (a) PAX 6(Ref: Emery genetics)The PAX-6 gene locus is a transcription factor for the various genes and growth factors involved in eye formation. Eye formation in the human embryo begins at approximately 3 weeks into embryonic development and continues through the tenth week.