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Related Concept Videos

Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes02:16

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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
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A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...
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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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Genetic Variation01:25

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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Related Experiment Video

Updated: May 6, 2026

A PCR-based Genotyping Method to Distinguish Between Wild-type and Ornamental Varieties of Imperata cylindrica
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Noncoding chloroplast DNA variation in Mexican pines.

J Perez de la Rosa1, S A Harris, A Farjon

  • 1Departmento de Botanica y Zoologia, Universidad de Guadalajara, Km 15.5 carreterra Guadalajara-Nogales, Apartado Postal 139, 45110, Zapopan, Jalisco, Mexico.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|October 31, 2013
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Summary

This study analyzed chloroplast DNA variation in 12 Mexican pine species. Findings reveal that Pinus section Parraya is not a monophyletic group, challenging previous classifications.

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Area of Science:

  • Botany
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Chloroplast DNA (cpDNA) is crucial for plant evolutionary studies.
  • Restriction site and length variation in cpDNA can reveal phylogenetic relationships.
  • Mexican pines (genus Pinus) exhibit complex evolutionary histories.

Purpose of the Study:

  • To investigate phylogenetic relationships among 12 Mexican pine species.
  • To analyze restriction site and length variation in noncoding chloroplast DNA regions.
  • To evaluate the monophyly of Pinus section Parraya.

Main Methods:

  • PCR amplification of three noncoding chloroplast DNA regions using universal primers.
  • Analysis of restriction site variation.
  • Identification of length mutations for diagnostic purposes.
  • Phylogenetic analysis based on combined restriction site and length variation data.

Main Results:

  • Two length mutations were identified with diagnostic value for pine subgenera/sections.
  • Phylogenetic analysis largely supported previous arrangements of Mexican pines.
  • The position of Pinus nelsonii suggested that Pinus section Parraya is not monophyletic.

Conclusions:

  • Chloroplast DNA variation provides insights into Mexican pine phylogeny.
  • The monophyly of Pinus section Parraya, as previously defined, is not supported by this cpDNA analysis.
  • Re-evaluation of pine classification may be necessary based on molecular data.