This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Null mutation is : 
Select and explain. 
A. Mutation occuring in Non Coding region., B. Mutation that does not change the amino acid or end product, C. Mutation that codes for a change in progeny without any chromosomal change, D. Mutation that leads to no functional gene product
D: Mutation that leads to no functional gene product
Answer: D: Mutation that leads to no functional gene product 
Explanation: D i.e. Mutation that leads to no functional gene product