Evolution Quote by Siddhartha Mukherjee
““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.””
About This Quote
Source Book: The Emperor of All Maladies, 2010
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?
A Different Perspective
Assumes recombination rates are uniform, which may not hold true.
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