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Related Concept Videos

The DNA Helix01:07

The DNA Helix

Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...
The DNA Helix01:16

The DNA Helix

Overview
The DNA Helix01:16

The DNA Helix

Overview
DNA as a Genetic Template02:05

DNA as a Genetic Template

Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
DNA as a Genetic Template02:05

DNA as a Genetic Template

Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
DNA Replication02:40

DNA Replication

DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied.  After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
Replication in Prokaryotes
DNA replication uses a large number of...

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Related Experiment Video

Updated: Jun 23, 2026

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
09:26

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation

Published on: December 29, 2021

Darwin would have loved DNA: celebrating Darwin 200.

Lindell Bromham1

  • 1Centre for Macroevolution and Macroecology, School of Biology, Australian National University, Canberra, ACT 0200, Australia. lindell.bromham@anu.edu.au

Biology Letters
|May 19, 2009
PubMed
Summary

Molecular evolutionary genetics is crucial for understanding evolution. DNA sequence analysis provides tools to investigate evolutionary questions and confirms Darwin's theories.

Area of Science:

  • Evolutionary biology
  • Molecular genetics
  • Genomics

Background:

  • Charles Darwin's theory of evolution by natural selection faced challenges.
  • Investigating evolutionary relationships and mechanisms requires robust methodologies.

Observation:

  • DNA sequence analysis has become a cornerstone of modern evolutionary biology research.
  • Molecular evolutionary genetics offers novel approaches to long-standing biological questions.

Findings:

  • DNA data provide empirical evidence supporting Darwin's evolutionary framework.
  • Molecular genetics resolves key issues within the theory of evolution by natural selection.
  • DNA analysis enables the exploration of Darwin's most compelling research questions.

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Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks
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Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks

Published on: November 25, 2015

Implications:

  • Molecular evolutionary genetics validates and expands upon Darwinian principles.
  • This field offers powerful tools for future evolutionary research.
  • DNA sequencing is revolutionizing our understanding of life's history and diversification.