Question

On crossing two heterozygous tall plants (Tt), a total of 500 plants were obtained in $F_1$ generation. What will be the respective number of tall and dwarf plants obtained in the $F_1$ generation?

• A. 375, 125
• B. 250, 250
• C. 475, 25
• D. 350, 150

Answer 1

The correct option is A 375, 125

• 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'.