According to the studies of Eyre-Walker and Keightley (2007),there appear to be four types of mutations observed in most organisms.Which of the following is NOT a type of mutation that is observed?

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The four types of mutations observed in most organisms are: deleterious (reduces fitness), lethal (causes death), neutral (no effect on fitness), and beneficial (increases fitness). "Additive" is not a type of mutation, but rather a term used in genetics to describe the collective effect of multiple genetic variations on a phenotype.

According to the Studies of Eyre-Walker and Keightley (2007),there Appear