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.
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The literature cites several potential causes of hybrid sterility (Borondi et al.
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.
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.
Two main obstacles that hinder alien gene transfer are hybrid sterility and chromosome asynapsis (Maan et al.
Lack of genetic recombination and hybrid sterility are obstacles that commonly occur with the use of alien germplasms.
1] hybrid sterility prevents the production of advanced generation hybrids that contribute greatly to the overall genetic variation of hybrid swarms.
Since Darwin's (1859) treatment of interspecific hybrid sterility, the evolutionary importance of hybrid incompatibilities in speciation has been well recognized.
Meiotic restitution is already known to occur in the wheats, functioning as a mechanism to reverse hybrid sterility (Shamina et al.
It could be argued that postmating barriers, such as hybrid sterility, might not be the first step in speciation.
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).
An analysis of hybrid sterility in rice using a diallel cross of 21 parents involving indica, japonica and wide compatibility varieties.