12. On crossing two heterozygous tall plants (Tt), a total of
500 plants were obtained in F, generation. What will be
the respective number of tall and dwarf plants obtained
in F, generation ?
(a) 375, 125
(c) 475, 25
(b) 250, 250
(d) 350, 150
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Answer: option (a)
Explanation: The phenotypic ratio of this cross is 3:1
This means, if there are a total of 4 parts then 3 parts are tall and 1 part is dwarf.
If we have 500 plants in total,
no. of tall plants = (3/4)*500 = 375
no. of dwarf plants = 500-375 = 125
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