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Attention, chocolate lovers: You may not be able to help yourselves. Swiss and British scientists have linked the widespread love of chocolate to a chemical "signature" that may be programmed into our metabolic systems.
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Z chromosome
Z chromosome: This is a sex chromosome in certain animals likes chickens, turkeys, and moths. In humans, males are XY and females XX. But in animals with a Z chromosome, males are ZZ and females are WZ.