Answer:
New inheritable characteristics would be least likely to result from mutations that occur in muscle and skin cells.
Step-by-step explanation:
Heritable characteristics are those that are part of the genotype and that will be transmitted from parents to children.
These characteristics can be passed on with some type of mutation, which are changes in the genetic material that occur naturally or are caused. A mutation is capable of changing an inheritable characteristic and often causing damage to the organism.
New inheritable characteristics would be less likely to result from mutations that occur in muscle cells and skin. As an example of this, we can say that if a child's father had a mutation in a skin cell that caused a dark spot on his arm, that characteristic would probably not be homestead. However, if the child's father has a mutation in a sex cell that results in a defect in one of his organs, this will be an easier characteristic to be inherited.