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Related Concept Videos

Lampbrush Chromosomes01:51

Lampbrush Chromosomes

In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...

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Resurrection of Dormant Daphnia magna: Protocol and Applications
07:37

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Published on: January 19, 2018

The first-generation Daphnia magna linkage map.

Jarkko Routtu1, Bastiaan Jansen, Isabelle Colson

  • 1Zoologisches Institut, Evolutionsbiologie, Universität Basel, Vesalgasse 1, 4051 Basel, Switzerland. jarkko.routtu@unibas.ch

BMC Genomics
|September 24, 2010
PubMed
Summary

Researchers developed the first genetic linkage map for Daphnia magna, a key tool for understanding traits and genome assembly. This map aids in quantitative trait loci (QTL) studies and comparative genomics.

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Area of Science:

  • Ecotoxicology, ecology, and evolutionary biology.
  • Aquatic invertebrate genomics.
  • Comparative genomics.

Background:

  • Daphnia magna is a vital model organism in environmental and evolutionary studies.
  • Genomic tools are advancing for D. magna, necessitating a linkage map.
  • Existing linkage maps exist for related species like Daphnia pulex.

Purpose of the Study:

  • To construct the first genetic linkage map for Daphnia magna.
  • To facilitate quantitative trait loci (QTL) studies and genome assembly.
  • To enable comparative genomic analyses with other Daphnia species.

Main Methods:

  • Generation of 214 F2 intercross clonal lines.
  • Linkage analysis using 109 microsatellite markers.
  • Construction of a linkage map comprising ten major linkage groups.

Main Results:

  • The D. magna linkage map spans 1211.6 Kosambi cM with an average marker interval of 15.1 cM.
  • Ten linkage groups were identified, varying in size.
  • Successfully mapped two loci associated with infertility alleles (Iinb1 and Xinb3).

Conclusions:

  • The D. magna linkage map offers comprehensive genomic coverage and marker density.
  • The map is suitable for detecting moderate to strong effect QTLs.
  • The map's size is comparable to that of D. pulex, supporting comparative studies.