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Which of the following will result in parental phenotype?

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Which of the following will result in parental phenotype?

(a) DCO in between two genes considering four strands

(b) Even number of DCO between two genes

(c) Odd number of DCO between two genes

(d) Single cross over at 4 strand stage between two genes

The question was posed to me during a job interview.

This interesting question is from Linkage and Crossing Over in division Genetic Recombination of Cytogenetics

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The correct choice is (b) Even number of DCO between two genes

Easy explanation: Even number of DCO between two genes leads to exchange of small parts between the two genes but the resultant is the same as the parental as the terminal genes remain unchanged.

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