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Integration events may be insertional involving _____ crossover or replacement involving _____ crossovers.

(a) single, single

(b) double, double

(c) double, single

(d) single, double

The question was posed to me in a national level competition.

This is a very interesting question from Generation of Transgenic Organsims in division Using Other Organisms of Genetic Engineering

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Correct choice is (d) single, double

The best explanation: Integration can be done by either insertion or replacement. Insertion is carried out by using single crossover and replacement is carried out by double crossover.

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