(a) If  we  cross  pure  -  bred  tall (dominant ) pea  plants  with pure - bred  dwarf ( rece o
Channel: Doubtnut
Date: 2020-04-19

(a) If  we  cross  pure  -  bred  tall (dominant ) pea  plants  with pure - bred  dwarf ( recessive ) pea plant  we  get  pea  plants  of   ` F_ 1  `  generation.  If  we  now  self- cross   the  pea plants  of  ` F_1  `  generation,  then  we  obtain pea  plants  of ` F_ 2  `  generation.      (i) What  do the plants  of   `F_1 ` generation  look like ?     (ii) What is   the  ratio  of  tall  plants   dwarf plants  in `  F_2  ` generation ?    (iii) State   the  type  of  plants  not  found  in  ` F_1 `  generation  but  appeared  in  `  F_2  `   generation,  mentioning   the  reason for the  same.     (b) What  are  homologous structures ? Give  an example. Is  it   necessary  that  homologous  structures always  have  common  ancestors ?