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WAEC Biology 1999 Question 55

Question 55

Mendelian Inheritance

The genotypic ratio of 1 : 2 : 1 in the offspring of a hybrid cross illustrates the law of

  1. A.use and disuse
  2. B.dominance
  3. C.segregation
  4. D.linkage
Show the answer and explanation

Answer: C (segregation)

Explanation

Crossing two hybrids (Tt × Tt) gives TT : Tt : tt in the ratio 1 : 2 : 1 because the two alleles separate (segregate) into different gametes.