--- title: "Meaning & Key Takeaway of: If A was tightly linked to B, and very…" description: "\"“If A was tightly linked to B, and very loosely linked to C, Sturtevant reasoned, then the three genes must be positioned on the chromosome in that ord..." image: "https://sms4smile.com/quotes/i/879/siddhartha-mukherjee-1619_evolution_if-a-was-tightly-linked-to-b-and-very-lo_2007302.png" --- # If A was tightly linked to B, and very loosely linked to… ![“If A was tightly linked to B, and very loosely linked to C, Sturtevant reasoned, then the three genes must be positioned on the chromosome in that order and with proportional distance from each other: A.B…..C. If an allele that created notched wings (N) tended to be co-inherited with an allele…” quote by Siddhartha Mukherjee](https://sms4smile.com/quotes/i/879/siddhartha-mukherjee-1619_evolution_if-a-was-tightly-linked-to-b-and-very-lo_2007302.png) [Download](https://sms4smile.com/quotes/i/879/siddhartha-mukherjee-1619_evolution_if-a-was-tightly-linked-to-b-and-very-lo_2007302.png) [Open image](https://sms4smile.com/quotes/i/879/siddhartha-mukherjee-1619_evolution_if-a-was-tightly-linked-to-b-and-very-lo_2007302.png) > ““If A was tightly linked to B, and very loosely linked to C, Sturtevant reasoned, then the three genes must be positioned on the chromosome in that order and with proportional distance from each other: A.B…..C. If an allele that created notched wings (N) tended to be co-inherited with an allele that made short bristles (SB), then the two genes, N and SB, must be on the same chromosome, while the unlinked gene for eye color must be on a different chromosome. By the end of the evening, Sturtevant had sketched the first linear genetic map of half a dozen genes along a Drosophila chromosome.”” [Siddhartha Mukherjee](https://sms4smile.com/quotes/author/siddhartha-mukherjee/) ## About This Quote This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation. Sturtevant inferred gene order from inheritance patterns, creating the first linear genetic map of Drosophila genes. **In simple terms:** Gene order can be deduced from how traits are inherited together. Key Takeaway Use linkage analysis to locate genes. Themes genetics research methodology Mood analytical inquisitive Type scientific historical When to use this quote - plant breeding - human disease gene discovery - educational genetics labs Key Concepts linkage chromosome mapping proportional distance Questions to Reflect On - How can varying recombination affect map accuracy? - What modern tools improve on this method? 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