Gregor Mendel, widely recognized as the progenitor of genetics, undertook investigations into the transmission of hereditary characteristics within pea plants. He meticulously chose opposing trait pairs to observe their intergenerational transfer. The traits examined by Mendel comprised:
Among the given options, the trait pair "Pink and white flowers" was not part of Mendel's research. He investigated "purple and white" flowers.
Consequently, the correct designation is: Pink and white flowers