Mutation load and rapid adaptation favour outcrossing over self-fertilization.

ABSTRACT: The tendency of organisms to reproduce by cross-fertilization despite numerous disadvantages relative to self-fertilization is one of the oldest puzzles in evolutionary biology. For many species, the primary obstacle to the evolution of outcrossing is the cost of production of males, individuals that do not directly contribute offspring and thus diminish the long-term reproductive output of a lineage. Self-fertilizing ('selfing') organisms do not incur the cost of males and therefore should possess at least a twofold numerical advantage over most outcrossing organisms. Two competing explanations for the widespread prevalence of outcrossing in nature despite this inherent disadvantage are the avoidance of inbreeding depression generated by selfing and the ability of outcrossing populations

SUBMITTER: Morran LT 

PROVIDER: S-EPMC4183137 | biostudies-literature | 2009 Nov

REPOSITORIES: biostudies-literature