Chapter 11 Introduction To Genetics - PowerPoint PPT Presentation

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Chapter 11 Introduction To Genetics

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Chapter 11 Introduction To Genetics Section 11-5 Linkage & Gene Maps Gene Linkage Thomas Hunt Morgan 1910 Using Fruit Flies Discovered Linkage Some Genes Are ... – PowerPoint PPT presentation

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Title: Chapter 11 Introduction To Genetics


1
Chapter 11Introduction To Genetics
  • Section 11-5
  • Linkage Gene Maps

2
Gene Linkage
  • Thomas Hunt Morgan
  • 1910 Using Fruit Flies
  • Discovered Linkage
  • Some Genes Are Inherited Together Counter To
    Mendel's Principle Of Independent Assortment
  • Turns Out, It Is The Chromosomes That Sort
    Independently, Not Individual Genes.

3
Gene Linkage
  • Why Did Mendel Miss This?
  • Six Of The Seven Genes He Studied Were On
    Different Chromosomes.
  • The Two That Were On The Same Chromosome Were So
    Far Apart That They Also Assorted Independently.

4
Gene Maps
  • Are Two Genes On The Same Chromosome Linked
    Forever?
  • No!
  • They Can Separate If
  • Crossing Over Occurs In Meiosis
  • This Produces New Combinations Of Alleles And
    Creates Genetic Diversity

5
Gene Linkage
  • Sturtevant, 1911
  • Morgans Student
  • Realized The Farther Away Genes Were From Each
    Other, The More Likely They Would Be Separated If
    Crossover Occurred
  • This Allows Gene Mapping

6
Gene Map - Linkage
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