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WAEC Biology 2020 Question 46

Question 46

Mendelian Inheritance

The diagram below is an illustration of a cross between plants A and B of the same species. If the F1 generation are plants with high yield and resistance, the genotype of the F1 generation plants would be

Diagram for this question
  1. A.YYRR.
  2. B.YyRr.
  3. C.yyRr.
  4. D.yyrr.
Show the answer and explanation

Answer: B (YyRr.)

Explanation

Plant A (YYrr) makes only Yr gametes and plant B (yyRR) makes only yR gametes. Every F1 plant is therefore YyRr: high yield and high resistance.