Mendel accounted for the observation that traits that had disappeared in the F1 generation reappeared in the F2 generation by proposing that

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Mendel proposed that traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1. In the F2 generation, the recessive trait could reappear if both parents contributed a recessive allele to their offspring. This was known as the principle of segregation, in which each individual carries two alleles for each trait but only expresses one of them.

Mendel Accounted for the Observation That Traits That Had Disappeared