Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Types of Selection

Types of Selection

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...

Conservation of Declining Populations

Conservation of Declining Populations

Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.

Mate Choice

Mate Choice

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.

Speciation Rates

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.

Convergent Evolution

Convergent Evolution

Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...

Conservation of Small Populations

Conservation of Small Populations

Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less likely to...

You might also read

Related Articles

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

Sort by

Same author

Association of single nucleotide polymorphisms of enamelin, tuftelin1, and matrix metalloproteinase 20 genes in South Indian children with early childhood caries: A case-control study.

Journal of the Indian Society of Pedodontics and Preventive Dentistry·2026

Same author

Growth Patterns and Permanent Tooth Eruption in 5-18-Year-Old School Children of Chennai, India: A Correlational Analysis.

American journal of human biology : the official journal of the Human Biology Council·2025

Same author

Enamel thickness and density of primary teeth with and without early childhood caries: a micro-computer tomography assessment.

European archives of paediatric dentistry : official journal of the European Academy of Paediatric Dentistry·2025

Same author

Are mobile health applications for traumatic dental injuries effective? A systematic review of their impact on diagnosis, prevention, management, and education.

European archives of paediatric dentistry : official journal of the European Academy of Paediatric Dentistry·2025

Same author

Bright fluorescent biocompatible Magnozyme nanoclusters for brain-cellin-vivo live imaging.

Colloids and surfaces. B, Biointerfaces·2025

Same author

Bioanalytical method development, <i>in-vivo</i> pharmacokinetic evaluation, <i>ex-vivo</i> platelet aggregation inhibition activity of a novel solid dispersion formulation of ticagrelor.

Frontiers in medical technology·2025

Search research articles

Related Experiment Video

Updated: Jul 11, 2026

Who is Who? Non-invasive Methods to Individually Sex and Mark Altricial Chicks

Who is Who? Non-invasive Methods to Individually Sex and Mark Altricial Chicks

Published on: May 24, 2014

Bird-headed dwarf of Seckel.

B G Harsha Vardhan¹, M S Muthu, K Saraswathi

¹Department of Oral Medicine and Radiology, Meenakshi Ammal Dental College and Hospital, Maduravoyal, Chennai, India. bgharshavardhan@yahoo.com

Journal of the Indian Society of Pedodontics and Preventive Dentistry

|December 6, 2007

Summary

Seckel syndrome is a rare genetic disorder causing severe growth delays before and after birth, leading to dwarfism. This condition also involves intellectual disability and distinctive facial features like a small head and beak-like nose.

More Related Videos

Visually Sexing Loggerhead Shrike (Lanius Ludovicianus) Using Plumage Coloration and Pattern

Visually Sexing Loggerhead Shrike (Lanius Ludovicianus) Using Plumage Coloration and Pattern

Published on: March 8, 2020

Dissection and Downstream Analysis of Zebra Finch Embryos at Early Stages of Development

Dissection and Downstream Analysis of Zebra Finch Embryos at Early Stages of Development

Published on: June 21, 2014

Related Experiment Videos

Last Updated: Jul 11, 2026

Who is Who? Non-invasive Methods to Individually Sex and Mark Altricial Chicks

Who is Who? Non-invasive Methods to Individually Sex and Mark Altricial Chicks

Published on: May 24, 2014

Visually Sexing Loggerhead Shrike (Lanius Ludovicianus) Using Plumage Coloration and Pattern

Visually Sexing Loggerhead Shrike (Lanius Ludovicianus) Using Plumage Coloration and Pattern

Published on: March 8, 2020

Dissection and Downstream Analysis of Zebra Finch Embryos at Early Stages of Development

Dissection and Downstream Analysis of Zebra Finch Embryos at Early Stages of Development

Published on: June 21, 2014

Area of Science:

Genetics
Pediatrics
Medical Case Reports

Background:

Seckel syndrome is an extremely rare autosomal recessive inherited disorder.
It is characterized by intrauterine and postnatal growth retardation, resulting in severe short stature (dwarfism).

Observation:

Patients exhibit microcephaly (abnormally small head).
Distinctive facial dysmorphisms include a prominent "beak-like" nose, large eyes, narrow face, malformed ears, and a small jaw.

Findings:

The abstract presents a case study of Seckel syndrome.
The condition is associated with varying degrees of intellectual disability.

Implications:

This case contributes to the understanding of Seckel syndrome's clinical presentation.
Highlights the importance of recognizing characteristic features for early diagnosis and management.