Genes and Chromosomes

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Genes and Chromosomes

• Chapter 13

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Genes and Chromosomes

• Gene linkage
• Linkage group
• None of Mendels seven traits were not gene
  linked.
• He lucked out.
• Saw independent assortment.
• Linked genes dont independently assort.

• Fruit Flies
• Drosophilia melongaster
• Thomas Hunt Morgan
• Why use?
• Wild type
• Mutations
• Mutants
• Mutagens

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Genes and Chromosomes

• Gene linkage and crossing over.
• Morgan hypothesized that this happened.
• Chromosome mapping
• Crossover frequency
• Sex chromosomes
• Autosomes

• Sex determination
• X chromosomes
• Y chromosome
• MaleXY
• FemaleXX
• Sex linkage
• X-linked traits
• Hemophilia, colorblindness, Hypertrichosis,
  Duchennes Muscular Dystrophy.

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Genes and Chromosomes

• Carriers
• Pedigree
• Y-linked characteristics
• Ear hair
• Aberrant Chromosomes

• Deletions
• Duplications
• Inversions
• Translocations
• Polyploidy

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