Final answer:
Kin selection is the form of natural selection that leads to an increase in the frequency of alleles which promotes the fitness of genetic relatives.
Step-by-step explanation:
Kin selection is the form of natural selection that leads to an increase in the frequency of alleles which promotes the fitness of genetic relatives. It occurs when individuals help close relatives who share many of the same genes. By helping close relatives, individuals increase the chances of passing on their genes to the next generation. Kin selection is an example of indirect selection and inclusive selection.