Question

How do Mendel experiments show that traits may be recessive or dominant

Answer 1

When he cross bred tallplants with short pea plants, his f1 progeny was full of tall plants but when he crossed the f1progeny with each other in f2 progeny  some were tall and rest were short. This proved that the shortness trait was present in f1 progeny itself but wasnt expressed because it was recessive. Amd tallness was the dominant trait.

Answer 2

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(a) Mendel demonstrated that traits can be either dominant or recessive through his monohybrid cross. He crossed true-breeding tall (TT) and dwarf (tt) pea plants. ... They appeared tall only because the tall trait was dominant over the dwarf trait. This shows that traits may be dominant or recessive.