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WAEC Biology 2010 Question 55

Question 55

Mendelian Inheritance

What would be the phenotypic ratio of the offspring of a cross between a heterozygous dominant parent and a double recessive parent?

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

Answer: B (1 : 1)

Explanation

Tt × tt gives Tt and tt in equal numbers, a 1 : 1 ratio (a test cross).