Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Cytochrome-b sequence variation among parrots.

T P Birt1, V L Friesen, J M Green

  • 1Department of Biology, Memorial University of Newfoundland, St. John's, Canada.

Hereditas
|January 1, 1992
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Effect of Stockholm Convention Listing on Temporal Trends of Halogenated Flame Retardants in Herring Gull Eggs in Canada (2008-2023).

Archives of environmental contamination and toxicology·2026
Same author

Popfinder: A Highly Effective Artificial Neural Network Package for Genetic Population Assignment.

Molecular ecology resources·2025
Same author

Minimalist style boot improves running but not walking economy in trained men.

Ergonomics·2020
Same author

Oiling of American white pelicans, common loons, and northern gannets in the winter following the Deepwater Horizon (MC252) oil spill.

Environmental monitoring and assessment·2020
Same author

MOLECULAR EVIDENCE FOR KIN GROUPS IN THE ABSENCE OF LARGE-SCALE GENETIC DIFFERENTIATION IN A MIGRATORY BIRD.

Evolution; international journal of organic evolution·2017
Same author

GENETIC STRUCTURE OF THICK-BILLED MURRE (URIA LOMVIA) POPULATIONS EXAMINED USING DIRECT SEQUENCE ANALYSIS OF AMPLIFIED DNA.

Evolution; international journal of organic evolution·2017

This study sequenced the mitochondrial cytochrome-b gene in 12 parrot species. Results reveal distinct phylogenetic relationships and a high transition:transversion ratio in parrot evolution.

Area of Science:

  • Avian genetics
  • Molecular evolution
  • Phylogenetics

Background:

  • Mitochondrial DNA (mtDNA) is crucial for understanding evolutionary relationships.
  • The cytochrome-b gene is a widely used marker for avian phylogenetics.
  • Parrot evolutionary history remains incompletely resolved.

Purpose of the Study:

  • To determine the nucleotide sequence of a mitochondrial cytochrome-b gene fragment in 12 parrot species.
  • To investigate sequence divergence and base composition patterns.
  • To infer phylogenetic relationships among parrot taxa.

Main Methods:

  • Polymerase chain reaction (PCR) amplification of a 307 bp mitochondrial cytochrome-b gene fragment.
  • Direct sequencing of the PCR products.

Related Experiment Videos

  • Phylogenetic analyses using transition and transversion substitutions.

    • Main Results:

    • Sequence divergence varied from 26-54 differences in pairwise comparisons.
    • A high transition:transversion ratio (approx. 24.3:1) was observed in recent parrot lineages.
    • Base composition was strongly biased, especially at the third codon position.
    • African genera Psittacus and Poicephalus are closely related.
    • Australian genera Nymphicus, Purpureicephalus, and Melopsittacus represent divergent lineages.
    • Cockatoos appear to represent an ancient parrot lineage.

    Conclusions:

    • Mitochondrial cytochrome-b gene sequences provide valuable insights into parrot phylogeny.
    • Distinct evolutionary patterns, including base composition bias and a high transition:transversion ratio, characterize parrot lineages.
    • Phylogenetic analyses support the close relationship of African genera and the ancient lineage of cockatoos.