Producing offspring by self-fertilisation or by crossing of parents that are very close genetically.
The breeding of close relatives in both plants and animals.
A situation where closely related males and females, or those with very similar genetic make-up, have children together, so allowing congenital conditions to be passed on.
Production of offspring by the mating of closely related persons (or other animals or plants).
The production of offspring by parents who are closely related; for example, who are first cousins or siblings. The amount of inbreeding in a population is largely controlled by culture and tradition.
The birth of offspring to parents who are closely related. In traditional rural communities, marriage between cousins was common and this could lead to a higher-than-average number of children with congenital anomalies or learning difficulties.