Also, monitoring should continue once products are on the market with the aim of linking genetic variability with clinical outcome.

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By dispersing, guppies move away from areas of heavy predation, minimize competition with one another and keep the species' genetic variability high, the researchers said.

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It is now known that genetic variability accounts for 25% of susceptibility to the disease, but that variations in the sickle-cell gene contribute to only a fraction of that.

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But new research found that, like stem rust, stripe rust increases its genetic variability by reproducing sexually on the leaves of another host plant (the barberry), making itself more adaptable and more deadly.

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Within populations, the interactions between environmental and individual factors, including genetic makeup, explain variability in body size between individuals.

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Throw in other environmental and behavioral factors (smoking, drinking, obesity and so on), and the variability exceeds that contributed by any genetic differences we will ever detect.

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