Question

how do mendleev's experiments show that traits may be dominant or recessive?

Answer 1

Mendel crossed tall pea plants with dwarf pea plants. He obtained tall plants in the first generation and when first generation was self crossed tall and dwarf pea plants were obtained in a ratio of 3 tall and 1 dwarf pea plants. This shows that the tall trait was dominant over the dwarf trait as in first generation no dwarf plant was obtained and in second generation tall plants was 75% as compared to 25% of dwarf plants.

Answer 2

Mendel conducted monohybrid crosses in pea plant.he produced F1 and F2 generationfrom tall(TT) and short (tt) plants.but he got only tall plants in F1 generation.He self pollinated two F1 progenies (Tt) and produced F2 progeny.both tall and short plants appeared in F2 generationin the ratio 2:1.This indicate that both tallness and shortness traits are inherited in F1 generation but only tallness is expressed.The trait which is expressed in F1 generation is called dominant trait and the trait which is suppressed or hidden in F1 generation and expressed in F2 generation is called as reccesive trait.