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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.

Mechanistic Models: Compartment Models in Individual and Population Analysis

Mechanistic Models: Compartment Models in Individual and Population Analysis

Mechanistic models are utilized in individual analysis using single-source data, but imperfections arise due to data collection errors, preventing perfect prediction of observed data. The mathematical equation involves known values (Xi), observed concentrations (Ci), measurement errors (εi), model parameters (ϕj), and the related function (ƒi) for i number of values. Different least-squares metrics quantify differences between predicted and observed values. The ordinary least squares (OLS)...

Genetics of Speciation

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...

Diversity of Protists II

Diversity of Protists II

Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...

Diversity of Protists IV

Diversity of Protists IV

Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...

Diversity of Protists III

Diversity of Protists III

Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...

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[Surface Microdeformations and Regulation of Cell Movements in Xenopus Development].

Ontogenez·2016

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[Mechano-geometric generative rules of morphogenesis].

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Related Experiment Video

Updated: Jun 6, 2026

Creating Objects and Object Categories for Studying Perception and Perceptual Learning

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[Parametric models of ontogenetic diversities].

|November 11, 2010

Summary

Morphogenesis modeling reveals narrow instability zones where small parameter changes cause drastic bud morphology shifts, driving evolutionary diversity. These zones offer evolutionary variation reserves.

Area of Science:

Developmental biology
Evolutionary biology
Mathematical modeling

Context:

Morphogenesis involves complex developmental processes.
Understanding ontogenetic diversity is crucial for evolutionary studies.
Parametric stability and instability influence biological form.

Purpose:

To model morphogenesis and identify key factors influencing structural stability and instability.
To explore the relationship between parameter shifts and morphological changes.
To investigate the role of instability zones in generating evolutionary variation.

Summary:

Modeling of morphogenesis reveals wide regions of structural stability and narrow zones of instability in parametric space.
Small parameter shifts within instability zones lead to drastic changes in bud morphology.

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These instability zones are identified as sources of ontogenetic diversity and reserves for evolutionary variation.

Impact:

Provides insights into the mechanisms generating biological diversity.
Highlights the importance of specific parameter values in determining developmental outcomes.
Suggests a framework for constructing models of ontogenesis based on negative feedback loops and parameter specificities.