In apple wool aphid is genetically controlled by___________________?
Correct answer: B. ID
- A. 2 D
- B. ID
- C. 2d
- D. Id
Explanation
Resistance to woolly apple aphid is generally described as being controlled by one dominant gene, often written as 1D in older MCQ notation. The option printed as “ID” is most likely an OCR error in which the numeral 1 became a capital I.
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