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Related Concept Videos

Types of Selection01:46

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...
Frequency-dependent Selection01:21

Frequency-dependent Selection

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.Positive Frequency-Dependent SelectionIn positive...
Morphogenesis02:19

Morphogenesis

Plant morphogenesis—the development of a plant’s form and structure—involves several overlapping developmental processes, including growth and cell differentiation. Precursor cells differentiate into specific cell types, which are organized into the tissues and organ systems that make up the functional plant.
Microbial Morphologies01:29

Microbial Morphologies

Bacterial and archaeal cells exhibit remarkable diversity in shape and structure, critical in their adaptability and functionality. Among bacteria, the most commonly observed shapes include cocci and bacilli. Cocci are spherical and may exist singly or in groupings such as pairs (diplococci), chains (streptococci), clusters (staphylococci), or tetrads. Bacilli, in contrast, are rod-shaped and can also occur as single cells, in pairs, or chains, depending on their environmental and genetic...

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Related Experiment Video

Updated: Jun 10, 2026

Morphological Analysis of Drosophila Larval Peripheral Sensory Neuron Dendrites and Axons Using Genetic Mosaics
09:42

Morphological Analysis of Drosophila Larval Peripheral Sensory Neuron Dendrites and Axons Using Genetic Mosaics

Published on: November 7, 2011

[Last morphological selection].

A Veiga1, G Arroyo, C Fallet

  • 1Service de Gynécologie Obstétrique, Hôpital Antoine Béclère, 157, Rue de la Porte Trivaux, 92150 Clamart, France.

Journal De Gynecologie, Obstetrique Et Biologie De La Reproduction
|August 24, 2010
PubMed
Summary
This summary is machine-generated.

Selecting embryos for transfer is crucial in assisted reproductive technology (ART). Multinucleation in cleavage stage embryos significantly lowers implantation and pregnancy success rates, impacting treatment outcomes.

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Area of Science:

  • Embryology
  • Reproductive Medicine
  • Assisted Reproductive Technology (ART)

Context:

  • Embryo selection is a critical determinant of success in ART procedures.
  • Assessing early-stage embryo development, including zygote morphology and blastomere quality, aids in predicting viability.
  • Multinucleation is an observed phenomenon in cleavage stage embryos.

Purpose:

  • To highlight the significance of embryo selection criteria in ART.
  • To identify key morphological indicators of embryo viability.
  • To investigate the impact of multinucleation on implantation and pregnancy rates.

Summary:

  • Embryo viability prediction relies on evaluating pronuclear morphology, zygote quality, embryo cleavage, and blastomere characteristics.
  • Multinucleation, a feature of cleavage stage embryos, is strongly correlated with reduced implantation and pregnancy rates.
  • These findings underscore the importance of careful morphological assessment for successful embryo transfer.

Impact:

  • Provides critical insights for optimizing embryo selection protocols in ART.
  • Aims to improve pregnancy outcomes by identifying detrimental morphological factors like multinucleation.
  • Contributes to a better understanding of early human embryogenesis and its clinical implications.