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A legal definition states: "Nonviable means not capable of living, growing, or developing and functioning successfully. It is the antithesis of viable, which is defined as having attained such form and development of organs as to be normally capable of living outside the uterus." [Wolfe v. Isbell, 291 Ala. 327, 329 (Ala. 1973)] [9]
In species that use the ZW sex-determination system the offspring genotype may be one of ZW (female), [30] [31] ZZ (male), or WW (non-viable in most species, [33] but a fertile, [dubious – discuss] viable female in a few, e.g., boas). [33] ZW offspring are produced by endoreplication before meiosis or by central fusion.
Hybrid incompatibility occurs when the offspring of two closely related species are not viable or suffer from infertility. Charles Darwin posited that hybrid incompatibility is not a product of natural selection, stating that the phenomenon is an outcome of the hybridizing species diverging, rather than something that is directly acted upon by selective pressures. [4]
Genetic incompatibility describes the process by which mating yields offspring that are nonviable, prone to disease, or genetically defective in some way. In nature, animals can ill afford to devote costly resources for little or no reward, ergo, mating strategies have evolved to allow females to choose or otherwise determine mates which are more likely to result in viable offspring.
Viable Paradise, an annual one-week writing workshop held each autumn on Martha's Vineyard; Viable system model, a scientific model by Stafford Beer of the organization of a viable or autonomous system; Viable system theory, a modelling approach that enables complex strategic and operative business and financial systems to be modelled and explored.
[1] [2] The term is generally used to mean the chance or ability of a population to avoid the problems of inbreeding. [1] Less commonly genetic viability can also be used in respect to a single cell or on an individual level. [1] Inbreeding depletes heterozygosity of the genome, meaning there is a greater chance of identical alleles at a locus. [1]
If the cells do not have high intracellular potassium and if intracellular sodium is low, then (1) the cell membrane may not be intact, and/or (2) the sodium-potassium pump may not be operating well. [6] [7] Flow cytometry using 7-Aminoactinomycin D (7-AAD), wherein a lower signal indicates viable cells. Therefore, this case shows good ...
At investigation, it may be found that the fetus remains viable and the pregnancy continues without further problems. [ medical citation needed ] An anembryonic pregnancy (also called an "empty sac" or "blighted ovum") is a condition where the gestational sac develops normally, while the embryonic part of the pregnancy is either absent or stops ...