Question

how did Mendel explain that it is possible that a trait is inherited but not expressed in an organisation

Answer 1

in mendel's experiment when pure tall pea plant was crossed with pure Dwarfs plants only tall pea plants were obtained in F1 generation

on selfing the pea plants of F1 generation both tall and dwarf pea plants were obtained in F2 generation .

reappearance of the dwarf plants in the F2 generation prove that the dwarf trait is inherited but not expressed in F1 generation ..

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Answer 2

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Mendel crossed a tall pea plant and a short pea plant of different characteristics and are produced progeny from them. The first generation (F₁) plants were all of them were tall. However, when the F₁ generation plants were crossed, the second (F₂) generation plants were not all of them were tall. Only, one-quarter of them was short. This indicates that both the tall and short traits were inherited in the F₁ plants but only the tallness trait was expressed.

This shows that it is possible that a trait is inherited but not expressed in an organism.