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Question


On crossing two heterozygous tall plants (Tt), a total of 500 plants were obtained in F1 generation. What will be the respective number of tall and dwarf plants obtained in the F1 generation?

  1. 375, 125
  2. 250, 250
  3. 350, 150
  4. 475, 25

A
475, 25
B
250, 250
C
375, 125
D
350, 150
Solution
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  • The crossing between two heterozygous plants is as shown in the image:
  • The phenotypic ratio of a heterozygous monohybrid cross is 3:1 (Dominant: Recessive)
  • So, if plants obtained were 500, then the respective number of tall and dwarf plants will be 375 tall and 125 dwarf, as this 375:125 (Tall: Dwarf) represents the typical 3:1 phenotypic ratio.
So, the correct answer is option 'A'.

1400104_931398_ans_c2369722816240a79deb4f1a84720ab7.png

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