Question

(a) If a purple-flowered pea plant (PP) is crossed with a white-flowered pea plant (pp), will
we have white-flowered pea plants in the Fi generation? Explain.
(b) What do you mean by dominant and recessive traits?
​

Answer 1

P generation

Purple-flowered White flowered

Pea plant Pea plant

PP pp

×

F1 Pp (purple-flowered).

Generation ( selfed)

F2 generation. Pp × Pp

PP Pp Pp pp

G ratio 1 : 2 : 1

P ratio 3 : 1

Questions

a) No,we have purple coloured flowers in F1 generation.

In monohybrid cross , in F1 generation, only one of the parental character ( dominant) is expressed.

Hence in F1 generation , we have only purple coloured flowers.( Dominant trait).

b) Dominant trait.

Trait that gets expressed in the offspring

For example, ‘Tall’ is a dominant trait of pea plants (TT, Tt).

Recessive trait.

Trait that remains hidden, dominated by the dominant trait

For example, ‘Dwarf’ is a recessive trait of pea plant ( tt).