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Understanding Gene Linkage and Chromosome Mapping

Explore how genes have a "home" on chromosomes, and understand gene linkage to uncover genetic variability. Discover how genes with similar functions are closely located on chromosomes, influencing inheritance patterns.

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Understanding Gene Linkage and Chromosome Mapping

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  1. Goal #6:Gene Linkage 1-20-12

  2. http://www.dnai.org/c/index.html I. Gene Maps 1. Genes have a “home” or locus • Ex: The gene for asthma is on the long arm of chromosome number 5!

  3. I. Gene Maps 1. Genes have a “home” or locus • Ex: The gene for blood groups is on the long arm of chromosome number 9!

  4. Location (LOC) A. Genes with similar functions will be located close to one another on a chromosome. • Ex) Chromosome 11 Olfactory Cluster

  5. B. Gene Linkage • Chromosomes cross over during Prophase I of Meiosis • At this time genes can become separated and placed on a different chromosome • Creates genetic Variability • Genes are assigned to Linkage Groups a. The closer 2 genes are to one another, the more likely they will stay together b. Therefore, we say that linked genes are inherited together.

  6. Fruit Fly Gene Map – partial

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