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Genome Size and the Evolution of New Genes

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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

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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.

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Updated: Jul 3, 2026

Assessment of DNA Contamination in RNA Samples Based on Ribosomal DNA

Assessment of DNA Contamination in RNA Samples Based on Ribosomal DNA

Published on: January 22, 2018

The genome sequence of Adonis annua L., 1753 (Ranunculales: Ranunculaceae).

Maarten J M Christenhusz^1,2, Sahr Mian¹,

¹Royal Botanic Gardens Kew, Richmond, England, UK.

Wellcome Open Research

|July 2, 2026

Summary

This summary is machine-generated.

We present a high-quality genome assembly for Adonis annua, also known as Pheasant's-eye. This research provides a foundational resource for understanding the genetic makeup of this important plant species.

Keywords:

Adonis annua Pheasant’s-eye Ranunculales chromosomal genome sequence

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Published on: January 25, 2019

Area of Science:

Genomics
Plant Science
Evolutionary Biology

Background:

The Darwin Tree of Life project aims to generate reference genomes for eukaryotic species in Britain and Ireland.
High-quality genome assemblies are crucial for understanding species' biology, evolution, and conservation.

Purpose of the Study:

To generate a comprehensive genome assembly for Adonis annua (Pheasant's-eye).
To provide a foundational genomic resource for the Ranunculaceae family and related species.

Main Methods:

Genome sequencing and assembly of Adonis annua.
Scaffolding of the assembly into chromosomal pseudomolecules.
Assembly and characterization of mitochondrial and plastid genomes.

Main Results:

A two-haplotype genome assembly with total lengths of 14,092.46 Mb and 14,120.81 Mb was generated.
Haplotype 1 was largely scaffolded into 16 chromosomal pseudomolecules (97.27%).
Mitochondrial and plastid genomes were assembled with lengths of 615.98 kb and 152.76 kb, respectively.

Conclusions:

The presented genome assembly represents a significant advancement for Adonis annua research.
This resource will facilitate future studies in plant genetics, evolution, and breeding.
The assembly contributes to the broader goals of the Darwin Tree of Life project.