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WAEC Agricultural Science 2011 Question 38

Question 38

Basic Genetics

If T represents the gene for tallness while t represents dwarfness: when a tall (TT) crop is crossed with a dwarf (tt) crop, the genotypic ratio of the second filial generation will be

  1. A.3:1
  2. B.1:2:1
  3. C.2:2
  4. D.4:0
Show the answer and explanation

Answer: B (1:2:1)

Explanation

Tt × Tt gives 1 TT : 2 Tt : 1 tt.