Before modern sequencing, they used linkage maps based on recombination frequencies from crosses—measuring how often traits separated told us the relative distance and order of genes on a chromosome. It was elegant detective work with phenotypes. But, you know, teaching my Class XII students in Shimla this very topic, I see their eyes glaze over at the statistics. What truly *map* the chromosome for them is when I compare it to the morning market—how often you see the *chai-wallah bhaiya* and the *samosa* stall together versus separate on your walk tells you how close they likely are. That sticky, real-world analogy from my valley walks makes the abstract stick.
#middle-distance#5000m
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