hybrid sterility


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hybrid sterility

the inability of some HYBRIDS to form functional gametes, due to chromosomes mispairing during MEIOSIS. This is a form of reproductive ISOLATION.
References in periodicals archive ?
Haldane's rule applies across many animal taxa, including others with a XO sex determination system (Haldane 1922, and one analysis found that it applied in 99% of 223 cases of sex-specific hybrid sterility and 90% of 115 cases of sex-specific hybrid inviability (Laurie 1997).
Therefore they recommended a dose of 250-300 Gy for a SIT program against LBAM if parental sterility was the desired outcome but that a lower dose could be used if [F.sub.1] hybrid sterility (IS) was desired to obtain "increased competitiveness of moths".
The literature cites several potential causes of hybrid sterility (Borondi et al., 1998) but the most obvious of these, previously observed in mules by Taylor and Short (1973) is due to the different numbers of parental chromosomes (Benirschke et al., 1962).
In vitro crosses promise a breakthrough in evolutionary biology: by bypassing hybrid sterility and inviability, we will ask which genetic changes underlie species differences.
The team's observation that the X chromosome had very little Neanderthal ancestry suggested something the scientists hadn't predicted -- a biological phenomenon called hybrid sterility. When two organisms are distantly related, Reich explains, genes related to fertility, inherited on the X chromosome, can interact poorly with genes elsewhere in the genome.
Postzygotic processes generally involve lowered viability of hybrids or hybrid sterility (Arnold 1997).
Two main obstacles that hinder alien gene transfer are hybrid sterility and chromosome asynapsis (Maan et al., 1999); genes affecting NC interactions may be directly or indirectly involved (Maan, 1975).
Lack of genetic recombination and hybrid sterility are obstacles that commonly occur with the use of alien germplasms.
Two new loci for hybrid sterility in cultivated rice (Oryza sativa L.).
While a great deal of effort has gone into determining the genetic basis of hybrid sterility, the actual "phenotype" of hybrid male sterility has typically been ignored.
An example is genetic consequences of large genome rearrangements and the role they play in hybrid sterility, this even suggesting possible barriers to gene transfer from one individual to another within the same taxon (Hewitt 1979, Gosalvez et al.
Meiotic restitution is already known to occur in the wheats, functioning as a mechanism to reverse hybrid sterility (Shamina et al., 1999).