Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Mate Choice01:20

Mate Choice

9.1K
Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
9.1K
Types of Selection01:46

Types of Selection

41.0K
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...
41.0K
Review and Preview01:13

Review and Preview

9.1K
Data are individual items of information obtained from a population or sample. Data may be classified as qualitative (categorical), quantitative continuous, or quantitative discrete. Because it is not practical to measure the entire population in a study, researchers use samples to represent the population. A random sample is a representative group from the population chosen by using a method that gives each individual in the population an equal chance of being included in the sample. Random...
9.1K
What is Natural Selection?01:32

What is Natural Selection?

116.1K
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.
116.1K
Frequency-dependent Selection01:21

Frequency-dependent Selection

22.2K
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.
22.2K
Competition02:34

Competition

22.1K
When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.
22.1K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Reporting Interest-Holder Engagement in Practice Guidelines: The RIGHT-MuSE Checklist.

Annals of internal medicine·2026
Same author

Editors' Choice: July 2026.

Journal of clinical epidemiology·2026
Same author

Editors' Choice: June 2026.

Journal of clinical epidemiology·2026
Same author

Editors' Choice: May 2026.

Journal of clinical epidemiology·2026
Same author

Editors' choice April 2026.

Journal of clinical epidemiology·2026
Same author

Editors' Choice: March 2026.

Journal of clinical epidemiology·2026
Same journal

A comparison of five statistical methods used to analyse longitudinal EORTC QLQ-C30 quality of life scores in randomised controlled trials: a simulation study.

Journal of clinical epidemiology·2026
Same journal

Sample Size Determination for Decision-centered Pragmatic Trials.

Journal of clinical epidemiology·2026
Same journal

Many multicenter randomized controlled trials do not account for center effect: a methodological review.

Journal of clinical epidemiology·2026
Same journal

Patient Acceptability of the Modified Zelen Approach to Randomized Trials - A Survey of the CAPS THA Cohort.

Journal of clinical epidemiology·2026
Same journal

Corrigendum to SPICE-GRADE: simultaneous processing of indirect causal evidence in complex pathways using GRADE - an exploratory case study. [Journal of Clinical Epidemiology, 194C (2026) 112219].

Journal of clinical epidemiology·2026
Same journal

Small numbers of clusters in cluster randomised trials: a scoping review of problems and proposed solutions.

Journal of clinical epidemiology·2026
See all related articles

Related Experiment Video

Updated: Aug 13, 2025

Author Spotlight: Addressing Technical and Subjective Challenges in Measuring Classroom Attention
06:37

Author Spotlight: Addressing Technical and Subjective Challenges in Measuring Classroom Attention

Published on: December 15, 2023

4.0K

Editors' Choice December 2022

David Tovey, Peter Tugwell

    Journal of Clinical Epidemiology
    |January 22, 2023
    PubMed
    Summary

    No abstract available in PubMed .

    More Related Videos

    Denaturing Gradient Gel Electrophoresis DGGE
    10:52

    Denaturing Gradient Gel Electrophoresis DGGE

    Published on: February 25, 2007

    21.4K
    Electrophoretic Separation of Proteins
    08:17

    Electrophoretic Separation of Proteins

    Published on: June 12, 2008

    33.8K

    Related Experiment Videos

    Last Updated: Aug 13, 2025

    Author Spotlight: Addressing Technical and Subjective Challenges in Measuring Classroom Attention
    06:37

    Author Spotlight: Addressing Technical and Subjective Challenges in Measuring Classroom Attention

    Published on: December 15, 2023

    4.0K
    Denaturing Gradient Gel Electrophoresis DGGE
    10:52

    Denaturing Gradient Gel Electrophoresis DGGE

    Published on: February 25, 2007

    21.4K
    Electrophoretic Separation of Proteins
    08:17

    Electrophoretic Separation of Proteins

    Published on: June 12, 2008

    33.8K