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Genetic Variation01:25

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While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
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Using Single-Worm Data to Quantify Heterogeneity in Caenorhabditis elegans-Bacterial Interactions
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Variations and heredity in bacterial colonies.

Jaroslav Čepl1, Anna Blahůšková2, Zdeněk Neubauer2

  • 1Czech University of Life Sciences, Faculty of Forestry and Wood Sciences , Prague, Czechia.

Communicative & Integrative Biology
|January 3, 2017
PubMed
Summary
This summary is machine-generated.

Bacterial colony appearance variations in Serratia marcescens are influenced by environmental factors and mutations. These factors can limit or expand the range of observable colony forms, impacting bacterial morphogenesis.

Keywords:
Serratiamorphogenesismutationplasticityself-manifestation

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Area of Science:

  • Microbiology
  • Developmental Biology
  • Bacterial Genetics

Background:

  • Spontaneous phenotypic variation is crucial for bacterial adaptation.
  • The F morphotype of Serratia marcescens exhibits a range of non-heritable variations.
  • Understanding factors influencing morphospace is key to developmental biology.

Purpose of the Study:

  • To investigate spontaneous variations in Serratia marcescens F morphotype colonies.
  • To determine how environmental factors and mutations affect colony appearance variability.
  • To explore the implications for models of early morphogenesis.

Main Methods:

  • Observation of Serratia marcescens F morphotype colonies.
  • Introduction of other bacterial species to assess environmental influence.
  • Induction of random mutations to study heritable changes.
  • Analysis of colony morphospace and variation patterns.

Main Results:

  • A repeatable set of non-heritable phenotype variations was observed.
  • Co-culturing with other species reduced variability, narrowing the morphospace.
  • Mutations led to new heritable morphotypes, expanding the accessible variation array.
  • Mutant morphospaces were distinct from the original F morphotype.

Conclusions:

  • Environmental factors and genetic mutations significantly shape bacterial colony morphogenesis.
  • The study supports a biphasic model of early morphogenesis applicable to multicellular organisms.
  • Bacterial colony variation provides insights into broader developmental principles.