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Genomics

Genomics

Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...

Genomic DNA in Eukaryotes

Genomic DNA in Eukaryotes

Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.

Genome Size and the Evolution of New Genes

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.

Genome Size and the Evolution of New Genes

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.

Genetic Material

Genetic Material

Within the human body, a complex and detailed system of trillions of cells works in unison to sustain life. Each cell houses a nucleus, which contains 46 chromosomes divided into 23 pairs. Chromosomes are highly coiled structures made of the genetic material DNA. These chromosomes are essential carriers of genetic information, with half inherited from the mother through her egg and the other half from the father's sperm, combining to create the unique genetic makeup of an individual.

Genomic DNA in Prokaryotes

Genomic DNA in Prokaryotes

The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
Genomic Diversity in Bacteria
Although bacterial genomes are much...

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Related Experiment Video

Updated: Jun 4, 2026

Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells

Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells

Published on: April 4, 2016

Not just another genome.

Diethard Tautz¹

¹MPI for Evolutionary Biology, Plön, Germany. tautz@evolbio.mpg.de

|February 8, 2011

Summary

This summary is machine-generated.

Sequence analysis of the Daphnia pulex genome revealed unexpected findings compared to other arthropods. These discoveries confirm Daphnia pulex as an exceptional eco-genetical model organism for future research.

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Area of Science:

Genomics
Ecology
Evolutionary Biology

Background:

The genome of Daphnia pulex, a crucial freshwater invertebrate, has been sequenced.
Comparative genomics across arthropods provides a framework for understanding invertebrate evolution.

Purpose of the Study:

To analyze the Daphnia pulex genome sequence.
To identify novel genetic insights not predicted by existing arthropod genomic data.
To establish Daphnia pulex as a premier eco-genetical model organism.

Main Methods:

Whole-genome sequencing of Daphnia pulex.
Comparative genomic analysis against other arthropod genomes.
Bioinformatic analysis of genomic data.

Main Results:

The Daphnia pulex genome contains unique sequences and structures.
Unexpected genetic features were identified that differ from other arthropods.
These findings highlight the distinct evolutionary path of Daphnia.

Conclusions:

The genomic landscape of Daphnia pulex presents novel evolutionary patterns.
Daphnia pulex is confirmed as an outstanding model for ecological and genetic studies.
Further research on the Daphnia pulex genome will advance understanding of adaptation and evolution.