Why don't the spontaneous deleterious mutations that occur in an individual e. coli cause downward drops in fitness in this population? see section 23.6 ( page 475) ?

Which best describes this behavior? it is beneficial only to the males that do not fertilize eggs. it is beneficial only to the female workers that are not fertilized. it is beneficial to each one of the individual colony members. it is beneficial to the whole species, but not to all of the individual members.