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In Morgan's data, the genes white and yellow showed only 1.3% recombination, while white and miniature wing showed 37.2%. This means:
AWhite and yellow are tightly linked (close together on the chromosome); white and miniature wing are loosely linked (far apart)
BAll three are independent genes
CWhite and yellow are on different chromosomes
DWhite and yellow are unlinked; white and miniature wing are linked
Answer & Solution
Correct answer: A. White and yellow are tightly linked (close together on the chromosome); white and miniature wing are loosely linked (far apart)
Recombination frequency increases with **distance between genes** on the same chromosome (because crossing over is more likely). Low % = tightly linked (close); high % = loosely linked (far apart). Sturtevant used this principle to make the first **genetic map**.
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