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How did Mendel explain that it is possible that a trait is inherited but not expressed in an organism?
Mendel, with the help of a monohybrid cross, explained that it is possible that inherited traits can remain inexpressible in an organism. The traits that remain inexpressible, although inherited are known as recessive traits.
In a monohybrid cross, the pure tall plant is crossed with a pure dwarf plant to produce heterozygous all tall plants in F1 progeny.
This cross is an example of a monohybrid cross as it involved only one characteristic, the height of the plant into consideration.
In the F1 generation, all the plants will be tall, while in the F2 generation, out of four plants, three will be tall and one dwarf.
Explanation:
In pea plant, when pure tall pea plant (TT) is crossed with pure short (tt) plant,
F1 generation will be all Tt (tall plant).
(Pure Tall) TT x tt (Pure short)
F1 generation Tt (All tall plant)
Self-pollination Tt x Tt
F2 generation TT Tt Tt tt
1 2 1
Thus, the ratio of pure tall plants (TT) to heterozygous breed tall plants (Tt) to pure short plants (tt) is 1:2:1.
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