Null mutation is
Mutation occuring in Non Coding region
Mutation that does not change the amino acid or end product
Mutation that codes for a change in progeny without any chromosomal change
Mutation that leads to no functional gene product
Null mutation/loss of function mutation/amorphic mutations:- These mutations are the result of gene product having less or no function. It occurs when the allele has a complete loss of function. Phenotypes associated with such mutations are most often recessive.