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JAMB Biology 1995 Question 44

Question 44

Mendelian Inheritance

The F1 of a cross between a tall and a dwarf plant was tall. The F1 was advanced to F2. How many of 120 F2 plants will be dwarf?

  1. A.30
  2. B.60
  3. C.90
  4. D.120.
Show the answer and explanation

Answer: A (30)

Explanation

F1 plants are Tt; crossing Tt × Tt gives 3 tall : 1 dwarf, so a quarter of 120 = 30 are dwarf.