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Related Experiment Videos

A genetic map of Phycomyces blakesleeanus.

M Orejas1, M I Peláez, M I Alvarez

  • 1Departamento de Genética, Facultad de Biología, Universidad de Salamanca, Spain.

Molecular & General Genetics : MGG
|November 1, 1987
PubMed
Summary

Genetic mapping in Phycomyces identified 11 linkage groups. Researchers analyzed auxotrophic mutants and genes for phototropism, carotenoid biosynthesis, and drug resistance, revealing new gene locations.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Mycology

Background:

  • Auxotrophic mutants in Phycomyces are valuable tools for genetic analysis.
  • Understanding gene linkage is crucial for constructing genetic maps and studying evolutionary relationships.

Purpose of the Study:

  • To genetically map various mutations in Phycomyces.
  • To identify the number of genes involved in specific metabolic pathways and traits.
  • To establish linkage groups for further genetic studies.

Main Methods:

  • Complementation tests were used to identify genes controlling auxotrophy.
  • 134 sexual crosses were performed involving mutants for phototropism, carotenoid biosynthesis, auxotrophy, and 5-fluorouracil resistance.
  • Random spore analysis, tetrad analysis, and gene-centromere distance calculations were employed.

Main Results:

  • Four genes for riboflavin auxotrophy, three for purine auxotrophy, two for nicotinic acid auxotrophy, and two for lysine auxotrophy were identified.
  • Mutations affecting phototropism (madA-madE), carotenoid biosynthesis (carA), auxotrophy (ribA-ribD, purA-purC, lysA, lysB, nicA, nicB, leuA), and 5-fluorouracil resistance (furA, furB) were analyzed.
  • These markers were found to be distributed across 11 distinct linkage groups.

Conclusions:

  • The genetic analysis successfully assigned numerous Phycomyces genes to 11 linkage groups.
  • This study provides a foundational genetic map for Phycomyces, aiding future research into its biology and genetics.

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