Question

How do the progeny of a tall plant with round seed an a short plant with wrinkled seed looks like? Which traits are recessive and which traits are dominant. ? What will be the F2 progeny when F1 progeny plants are self pollinated. Show it with the help of diagram

Answer 1

The progeny of a tall plant with round seed (TTRR) and a short plant with wrinkled seed (ttrr) would be Tall plant with round seeds (TtRr) and thus will appear same as the allele for tall plant and round seeds are dominant over the alleles for short plants with wrinkled seeds.

Answer 2

1) The progeny of the plants will be tall plant with round seed.

2) The recessive traits are Short plant with wrinkled seed.

3) F2 progeny will be 25% tall plant with round seed (pure)

                        25% short plant with wrinkled seed (pure)

                        50% tall plant with round seed (hybrid)

Explanation:

                   Tall plant/round seed                       Short plant/wrinkled seed

                                TTRR                                                          ttrr

            TR                                  TR                           tr                           tr

    TtRr                                TtRr                              TtRr                       TtRr

All organisms are hybrid tall and round seed plant.

                                 TtRr    are  selfed

Gametes are TR,Tr, tR,tr

The result of the cross is

        T_R_                   T_rr                               ttR_               ttrr

Tall, round           Tall, wrinkled            short, round       short, wrinkled

seed plant             seed plant                seed plant             seed plant

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