The Correct answer is All are tall. In a monohybrid test cross, involving a heterozygous tall plant (Tt) and a pure dwarf plant, the progeny consists of tall and dwarf plants in the ratio of 1:1. In F1 generation, both progenies should be tall. In F2 generation, progenies should be tall and dwarf in the ratio of 75:25. Additional InformationFather of Genetics: Gregor Mendel He discovered the fundamental laws of inheritance and hybridization. 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.