In flowering plants, the transition from cross-fertilization (outcrossing) to self-fertilization has evolved repeatedly across species. This shift is often accompanied by a well-known set of traits ...

Inbreeding depression refers to the reduction in fitness and vigour that occurs when closely related individuals mate, leading to increased homozygosity and the unmasking of deleterious recessive ...

Contributed by Spencer C. H. Barrett, received August 24, 2022; accepted November 28, 2022; reviewed by Deborah Charlesworth and Jeffrey Karron This contribution is part of the special series of ...