hybrid sterility


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hybrid sterility

[′hī·brəd stə′ril·əd·ē]
(genetics)
Inability to form functional gametes in a hybrid due to disturbances in sex-cell development or in meiosis, caused by incompatible genetic constitution.
References in periodicals archive ?
(a) When the genetic differences between parental species are so great that [F.sub.1] hybrid sterility prevents the production of advanced generation hybrids that contribute greatly to the overall genetic variation of hybrid swarms.
A "single-locus allelic interaction" model involving three alleles at locus S5 on chromosome 6, that is, S5i (indica), S5j (japonica) and S5n (neutral), has been tested to analyze hybrid sterility (Ikehashi and Araki, 1986).
Hybrid sterility may at least partially explain why all confirmed examples of diploid hybrid speciation are outcrossers; selfing does not matter because it is unlikely to occur in semisterile hybrids.
An analysis of hybrid sterility in rice using a diallel cross of 21 parents involving indica, japonica and wide compatibility varieties.
This seems like a very great number, and in fact it may be biased by extrapolation from studies of the X chromosome, which may be exceptional in regard to hybrid sterility (Laurie 1997), as well as by the inclusion of genes causing hybrid sterility that arise since speciation.
Hybrid sterility in Drosophila is known to be germ-cell autonomous (Dobzhansky and Beadle 1936), but spermatogenic defects in only a few studies have been characterized cytologically (Naveira and Fontdevila 1991; Pantazidis et al.
Kelly and Noor (1996) have further shown with autosome-autosome interactions that assuming an epistatic rather than additive source of hybrid sterility restricts the conditions under which reinforcement will occur.
Nekken 2 is a weakly dormant cultivar and possesses a particular allele [S-5.sup.n] for `wide-compatibility'; the hybrids between this cultivar and many of indica type are free of hybrid sterility (Ikehashi and Araki, 1986).
The marker, which is within 5 cM of the S-5 hybrid sterility locus (Yanagihara et al., 1995), correctly identified S-5 alleles from cultivars and breeding lines ([STS213.sup.j] and [S-5.sup.j]: Akihikari, S201, M103, M201, M202, M204, M401; [STS213.sup.n] and [S-5.sup.n]: Ketan Nangka, Moroberekan, Lemont, A301, L202, L203; [STS213.sup.i] and [S-5.sup.i] IR36, IR50, data not shown) and was used to predict the genotype of [F.sub.3] individuals at the S-5 locus (Fig.
We failed to find any relationship between [F.sub.1] hybrid sterility and the level of FA.