Kin recognition

Kin recognition, also called kin detection, is an organism's ability to distinguish close genetic relatives from unrelated individuals. It is often explained as an adaptation for avoiding inbreeding, though a 2021 meta-analysis of 88 diploid species found that animals rarely actually avoid inbreeding in practice, except where offspring are raised alongside their parents, since that shared upbringing itself serves as a reliable cue of kinship. Kin recognition is also proposed as the mechanism behind kin selection, letting organisms direct cooperative or altruistic behavior toward relatives, though scientists disagree about how much of this depends on a true recognition ability rather than simpler cues such as familiarity; the human Westermarck effect, in which people raised together in childhood lose sexual interest in each other, is a widely cited example of a proximity-based cue standing in for genetic kin recognition. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/