More varity in a population
Well a Silent Mutation does not affect anything so it isn't bad so its a good mutation.
The mutation may be passed on to an offspring. Depending on the mutation, it may have no effect, or it could be lethal.
It can have absolutely no affect, a bad affect, or even a good affect.*Deletion and Addition are frameshift: most harmful.
More varity in a population
It will change the order of bases:) could cause diseases such as; Cystic Fibrosis
A mutation in a sex cell can be passed on to your offspring and to their offspring as well. Therefore, its effect is greater than that of a somatic mutation.
A deleterious mutation has a negative effect on the phenotype, and thus decreases the fitness of the organism. (A harmful mutation)
A point mutation, in which one nitrogen base in a codon is substituted for another, may have no effect on an organism. This is true if the base substitution does not change the amino acid that the codon represents, or if the mutation occurs in a non-critical location in the protein so that the protein's structure is not changed significantly and the protein is still able to function.
No one knows what effect a mutation may have. Most are not viable.
A good mutation is BACTERIAL FLAGELLA. A bad mutation is DOWN SINDRAM
A silent mutation has the least effect on an organism. It is when the codon is changed to the same amino acid.
If a particular mutation occurs in nature and proves to be beneficial, it can change the entire species to begin to have the same mutation and thus the same good trait. A creature with a mutation that say, gives it a longer tail (and chicks dig a long tail) than he will mate and that mutation will allow his genes to pass on.