Final answer:
Inbreeding can have evolutionary consequences in conjunction with the occurrence of rare, harmful mutations and genetic incompatibility between closely related individuals. This can lead to decreased fitness and increased abnormalities and disease in the offspring produced by inbreeding.
Step-by-step explanation:
Along with the emergence of uncommon, damaging mutations and genetic incompatibility between closely related people, inbreeding can have evolutionary effects.
Inbreeding can bring together rare, deleterious mutations that lead to harmful phenotypes. This means that offspring produced by inbreeding are more likely to inherit harmful genetic mutations that can decrease their fitness.
Additionally, close relatives can be genetically incompatible, which means that their DNA may react negatively in the offspring, leading to reduced fitness and increased abnormalities and disease.