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Gregor Mendel, through his work on pea plants, discovered the fundamental laws of inheritance. He deduced that genes come in pairs and are inherited as distinct units, one from each parent. Mendel tracked the segregation of parental genes and their appearance in the offspring as dominant or recessive traits. He recognized the mathematical patterns of inheritance from one generation to the next.
In this example, he crossed a purebred white-flowered pea plant with a purebred purple-flowered pea plant. These plants are the parental, or P, generation. The resulting offspring, called the first filialâor F 1 âgeneration, all had purple flowers. The trait for white flowers seemed to disappear. When Mendel allowed the F 1 generation to self-fertilize, the resulting F 2 generation produced both plants with purple flowers and plants with white flowers. Therefore, the trait for white flowers had not disappeared; it had been hidden, or masked. traits that were hidden when parental purebred flowers were crossed reappeared when the F 1 generation was allowed to self-pollinate.