Tallness of pea plant is dominant trait, while dwarfness is the alternate recessive trait. When a pure line tall is crossed with a pureline dwarf, what fraction of tall plants in F₂ - generation shall be heterozygous? Give reasons.
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After performing monohybrid cross for height of pea plants,we find:
Phenotypic ratio = Tall : dwarf
3 : 1
Genotypic ratio = TT : Tt : tt
1 : 2 : 1
Half of tall progenies are heterozygous because gene for tallness (T) is dominant and also expresses itself in heterozygous condition ie., Tt
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