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a farmer observe some pea plants in his garden some are tall and have round.some are balled and wrinkle seeds but he wants all pea plants to be tall and have round seeds if not all atleast 90./. of plants can he get all desirable characters or not?

Answer :

tanishqsingh

if we take the parents  as , TTRR                                                      ttrr
                       Gamets are    TR  TR                                                tr  tr  

F1 ----->    TR         TR
           tr      TtRr      TtRr
           tr      TtRr      TtRr
SO the phenotype wud be "ALL TALL AND ROUND"----------> 100% result
 
For the F2 progeny , gamets are   :  TR  Tr  tR  tr

F2----->       TR          Tr            tR          tr
       TR      TTRR     TTRr     TtRR       TtRr
       Tr       TTRr       TTrr      TtRR      Ttrr
       tR       TtRR       TtRr       ttRR      ttRr
       tr         TtRr        Ttrr        ttRr       ttrr

So, the phenotype : 9:3:3:1
                                     9---Tall and Round
                                     3---Tall and wrinkled
                                     3---balled and Round
                                     1---balled and wrinkled
Here the % of Tall and Round would be [tex] \frac{9}{16} X100= 56.25%[/tex]

So, he won't get 90% results if he goes for F2 progeny.


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