Question

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

Answer 1

Mendel crossed pure bred tall pea plant with pure bred dwarf pea plant. He found that progeny produced in f i generation is tall and called it dominants trait.
He then crossed pure bred tall pea plant produced in first generation with another tall plant of same generation. He found that tall plants and dwarf plants are produced in 3 ratio 1. He called dwarf trait expressed trait.

Answer 2

According to mendel's experiment the traits is dominant if one or both the allele that code for a particular character is dominant, whereas when the dominant gene is not present in that allele, then it is recessive. eg,TT coats for tallness and tt for drawfness.T is dominant and t is recessive. Also Tt is dominant due to the present of dominant gene T