Chapter 11 Summary

The topics covered in this chapter can be summarized as follows:

  • A genetic map (or recombination map) is a representation of the linear order of genes (or loci), and their relative distances determined by crossover frequency, along a chromosome.
  • Recombination frequency is usually proportional to the distance between loci, so recombination frequencies can be used to create genetic maps.
  • Recombination frequencies tend to underestimate map distances, especially over long distances, since double crossovers may be indistinguishable from non-recombinants.
  • Three-point crosses can determine the order and map distance among three loci.
  • In three-point crosses, a correction for the distance of the outside markers can be made to account for double crossovers between the two outer loci.
  • Interference is used to describe the degree to which one crossover interferes with other crossovers in the region at the chromosome in question.


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Introduction to Genetics Copyright © 2023 by Natasha Ramroop Singh, Thompson Rivers University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.

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