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The cross between RrTt and rrtt where R is a gene for red colour and...

Biology
WAEC 2019

The cross between RrTt and rrtt where R is a gene for red colour and T for tallness will result in______

  • A. all the offspring being tall with red fruits
  • B. 25 % tall with red fruits
  • C. 50 % tall with red fruits
  • D. 75 % tall with red fruits
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Correct Answer: Option B
Explanation

Since both (R) (red color) and (T) (tallness) are dominant traits, only the (RrTt) offspring will display the phenotype of being tall with red fruits, which comprises exactly (25%) of the total progeny.

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