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Coupling vs Repulsion? The following testcross Aa Bb x aa bb produces 10 Aa Bb 40...

Coupling vs Repulsion?
The following testcross Aa Bb x aa bb produces
10 Aa Bb
40 Aa bb
40 aa Bb
10 aa bb
Were the A and B alleles in the Aa Bb parent in coupling or repulsion and why?

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Answer #1

A and B in parent AaBb were in coupling as the term coupling means the linkage of dominant genes are provided by one parent only as mentioned in the question in the given test cross.

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