(a) What will you get in the F1 and F2 generations in the following cross?     Pure tall pea plant x Pure dwarf pea plant(b) Is it an example of monohybrid cross or dihybrid cross? 

Correct Answer: 

(a) In the F1 generation, all the plants will be tall, while in the F2 generation, out of four plants, three will be tall and one dwarf.

(b) This cross is an example of a monohybrid cross as it involved only one characteristic, the height of the plant into consideration.


In pea plant, when pure tall pea plant (TT) is crossed with pure short (tt) plant,

F1 generation will be all Tt (tall plant).

                                        (Pure Tall)   TT        x        tt   (Pure short) 

F1 generation                                                 Tt    (All tall plant)

Self-pollination                                 Tt         x         Tt

F2 generation                         TT           Tt           Tt           tt

                                                     1                      2                     1

Thus, the ratio of pure tall plants (TT) to heterozygous breed tall plants (Tt) to pure short plants (tt) is 1:2:1.


Simply Easy Learning

Updated on: 20-Mar-2023


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