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Related Concept Videos

What is Natural Selection?01:32

What is Natural Selection?

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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.
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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
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Types of Selection01:46

Types of Selection

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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...
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Frequency-dependent Selection01:21

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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.
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Associative learning, a core principle in behavioral psychology, involves forming connections between events and facilitating learned responses. This concept is vividly illustrated by classical conditioning, a process extensively studied by the Russian physiologist Ivan Pavlov. Pavlov's pioneering research on dogs' digestive systems led to the discovery that behaviors can be learned through association, laying the groundwork for classical conditioning.
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Related Experiment Video

Updated: Feb 15, 2026

Characterization of Aquatic Biofilms with Flow Cytometry
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A multichannel computer-driven system to raise aquatic embryos under selectable hypoxic conditions.

Sanjeeva Metikala1,2, Herbert Neuhaus1, Thomas Hollemann1

  • 1Department of Medical Molecular Biology, University Halle-Wittenberg, Institute for Physiological Chemistry, Halle, Germany.

Hypoxia (Auckland, N.Z.)
|February 3, 2018
PubMed
Summary

Hypoxia, or low oxygen, delays embryonic development in Xenopus laevis. Oxygen availability is most critical during gastrulation and organogenesis for proper cardiovascular system formation.

Keywords:
Xenopusamiculture conditionser71hypoxiavasculogenesis

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Area of Science:

  • Developmental biology
  • Cardiovascular system development
  • Hypoxia research

Background:

  • Cardiovascular system formation is vital for early vertebrate embryos.
  • The impact of hypoxia on embryonic development is understudied, especially in placental vertebrates.
  • Aquatic embryos offer a model to study hypoxia effects.

Purpose of the Study:

  • To investigate the effects of hypoxia on Xenopus laevis embryonic development.
  • To establish a method for culturing embryos under controlled hypoxic conditions.
  • To identify critical developmental stages sensitive to oxygen availability.

Main Methods:

  • Cultured a large number of Xenopus embryos to tadpole stage.
  • Utilized four hypoxia chambers for simultaneous controlled hypoxic conditions.
  • Employed a computerized system for precise oxygen level management.

Main Results:

  • Hypoxia generally resulted in delayed embryonic development.
  • Oxygen availability was found to be most crucial during gastrulation and organogenesis (early tailbud stages).
  • Demonstrated a protocol for studying hypoxia in aquatic vertebrate embryos.

Conclusions:

  • Hypoxia significantly impacts Xenopus laevis embryonic development, causing delays.
  • Gastrulation and early organogenesis are sensitive periods requiring adequate oxygen.
  • The established culture protocol facilitates further research into hypoxia's developmental effects.