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What is Natural Selection?01:32

What is Natural Selection?

129.9K
Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
129.9K
Antibiotic Selection00:57

Antibiotic Selection

60.3K
Overview
60.3K
Types of Selection01:46

Types of Selection

45.3K
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
45.3K
Frequency-dependent Selection01:21

Frequency-dependent Selection

24.2K
When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
24.2K
Natural Selection and Adaptation01:15

Natural Selection and Adaptation

1.5K
Natural selection, a fundamental concept in evolutionary biology, is the mechanism by which evolution is driven, favoring organisms that are best adapted to their environments. This process enhances their chances of survival and reproduction. Adaptation, a key outcome of this process, involves genetic modifications that optimize an organism's functionality under specific environmental challenges, such as extreme cold or thinner air at high altitudes.
Beyond physical adaptations,...
1.5K
Limits to Natural Selection01:38

Limits to Natural Selection

35.4K
Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
35.4K

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Related Experiment Video

Updated: Feb 16, 2026

Using Generative Art to Convey Past and Future Climate Transitions
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Using Generative Art to Convey Past and Future Climate Transitions

Published on: March 31, 2023

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Selective laser trabeculoplasty: past, present, and future.

A Garg1, G Gazzard2

  • 1Department of Glaucoma, Moorfields Eye Hospital, London, UK.

Eye (London, England)
|January 6, 2018
PubMed
Summary

Selective laser trabeculoplasty (SLT) is a key laser treatment for lowering eye pressure in glaucoma patients. This review covers SLT

Area of Science:

  • Ophthalmology
  • Glaucoma Research
  • Laser Therapy

Background:

  • Selective laser trabeculoplasty (SLT) has gained prominence over 20 years.
  • It is a standard laser treatment for reducing intraocular pressure.
  • SLT is used for open-angle glaucoma and ocular hypertension.

Purpose of the Study:

  • To review the evolution of SLT from argon laser trabeculoplasty.
  • To define the current clinical applications of SLT.
  • To explore future research and emerging technologies in SLT for glaucoma management.

Main Methods:

  • Literature review of selective laser trabeculoplasty.
  • Analysis of historical context and current clinical practice.
  • Identification of future research trends and technological advancements.

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In vivo Laser Axotomy in C. elegans
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In vivo Laser Axotomy in C. elegans

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Main Results:

  • SLT has evolved significantly from earlier laser treatments.
  • It is a well-established and effective intervention for lowering intraocular pressure.
  • Ongoing research and new technologies promise further advancements.

Conclusions:

  • Selective laser trabeculoplasty is a cornerstone in glaucoma treatment.
  • Understanding its history and current role is crucial.
  • Future developments are expected to enhance its efficacy and application.