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Introductory Chapter: Challenges and Advances in Animal Genetics

The term heredity comes from Greek (gr. Hereditas), which means to inherit. Biologically, heredity refers to the inheritance of some “features and characters” from the parents to the descendants. In fact, not the characters themselves are inherited, but the potentiality of their apparition, intermediated by some material particles named genes (gr. genan = to produce, to give birth). The resulted gametes do not possess the parental characters, but they possess the parental genes which are transmitted to the future organism. The resulted zygote will form a new organism which will have particular features and characters, which will only resemble the parents to a certain extent.