Principles of Inheritance and Variation

Linkage and Recombination – Gene Mapping

2 questions from 2 papers, each with its answer.

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Concepts tested

  • gene order from recombination frequencies
  • Sturtevant and gene mapping

All Questions

2022 1 question

  1. 1 Principles of Inheritance and Variation Hard
    The recombination frequency between the genes a & c is 5%, b & c is 15%, b & d is 9%, a & b is 20%, c & d is 24% and a & d is 29%. What will be the sequence of these genes on a linear chromosome?

2019 1 question

  1. 2 Principles of Inheritance and Variation Easy
    The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by: