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WAEC Biology 2019 Question 46

Question 46

Mendelian Inheritance

In a complete dominance monohybrid cross between a pure breeding yellow flowered plant Y and a pure breeding white flowered plant y, the result of the first filial generation is

  1. A.50 % yellow flowers.
  2. B.75 % yellow flowers.
  3. C.all yellow flowers.
  4. D.all white flowers.
Show the answer and explanation

Answer: C (all yellow flowers.)

Explanation

YY × yy gives only Yy offspring. Yellow is dominant, so every F1 plant has yellow flowers.