Many. Depending on the organism, mutations can cause things like four leaves on a clover, to polydactily or sicle cell anemia. The effects can be good, bad or neutral.
No not all mutations are bad there are good mutations and bad mutations
Some mutations are neutral because an amino acid can be more than one anti-codon. However, mutations that do cause change can be good, bad, or neutral depending on how it changes its' form. I don't want to go over all of them!
Not all mutations are bad. Some mutations can be neutral, having no effect on an organism. And in some cases, mutations can be beneficial, providing an advantage in certain environments or circumstances. However, harmful mutations can also occur, leading to genetic disorders or other negative effects.
Mutations are unnatural changes in the body or behavior. They are not always bad. For instance, the skin of the poison tree frog is not really bad at all. It rubs itself on poison leaves and mutated itself not to be affected.
They're called silent mutations.
A third arm wouldn't be bad.
Genetic mutations can be good or bad, but evolution refers specifically to those mutations that make an organism better able to survive and to perpetuate their species, which makes them generally a good thing.
Neutral.
He is a neutral meaning not good or bad.
Neutral mutations confer no benefits or handicaps and are therefore not affected by natural selection.
Lethal mutations cause such a radical change that the organism cannot live with it and dies. A neutral mutation is a simple change that does not affect the organism in any way, such as a new eye colour.