Self-Fertilization


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Related to Self-Fertilization: cross-fertilization

Self-Fertilization

 

the merging of male and female sex cells belonging to a single bisexual individual (see HERMAPHRODITISM). Self-fertilization is rarely observed in nature. In the process of evolution, most organisms acquired adaptations that made self-fertilization impossible and ensured cross-fertilization. These adaptations increased the genetic variation of the off spring, promoting, in turn, the elaboration of new adaptations and the development of more viable offspring. Self-fertilization is sometimes observed in hydras, flatworms, certain annelids, mollusks, and fishes. Among plants it is observed in many algae, fungi, and flowering plants. In flowering plants self-fertilization is a result of self-pollination.

References in periodicals archive ?
The consequences of self-fertilization and outcrossing of the cestode Schistocephalus solidus in its second intermediate host.
Many plants display intermediate levels of self-fertilization (Schemske and Lande 1985; Aide 1986; Barrett and Eckert 1990; Husband and Schemske 1996).
The variation in self-fertilization rate was attributed to the amount of eggs being liberated at the time of collection.
The existence of left- and right-handed flowers has fascinated botanists for years, but until now, there had been little data to back up the theory that the style orientation worked to limit self-fertilization, says Kress.
The proportion s can be changed artificially by hand-pollination from s = 1 with self-fertilization of all plants to s = 0 when plants are intercrossed.
Multiple generations of infection-induced self-fertilization would generate highly homozygous lines infected by a single fungal genotype within the more randomly breeding uninfected members of the population.
Table 2 Clinch production and self-fertilization for specimens from Trial 2 that differed in development mode of their eggs Lecithotrophic Planktotrophic Reproductive (n = 22) (n = 9) characteristic % of 62.
To induce spawning, the combined method of by injecting serotonin into scallop's adductor muscle (Cruz & Ibarra 1997) and thermal shock by raising water temperature from 18[degrees]C to 23[degrees]C was used, and the following procedure was able to prevent self-fertilization.
Scientists had observed that polyploidy can permit self-fertilization.
e] could be reduced further as a consequence of frequent self-fertilization, which limits the number of parents contributing genes to the next generation.
Because of this mode of reproduction, we asked whether self-fertilization could occur when non-self sperm were also present.
Finally, there is the question whether the reproduction of the two triploid Corbicula species involves self-fertilization, cross-fertilization, or parthenogenesis.