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Related Concept Videos

Meiosis I03:09

Meiosis I

Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Meiosis I01:49

Meiosis I

Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by a...
Crossing Over01:30

Crossing Over

Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...
Crossing Over01:34

Crossing Over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
Hybrid Zones02:29

Hybrid Zones

Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.Gene flow and natural selection are evolutionary mechanisms that shape the outcome of a hybrid zone. Gene flow...
Gene Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...

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Related Experiment Video

Updated: Jul 2, 2026

Mosaic Zebrafish Transgenesis for Functional Genomic Analysis of Candidate Cooperative Genes in Tumor Pathogenesis
09:45

Mosaic Zebrafish Transgenesis for Functional Genomic Analysis of Candidate Cooperative Genes in Tumor Pathogenesis

Published on: March 31, 2015

From curiosity to clinical relevance: Rethinking genetic mosaicism.

Mindy B Tinkle1, Sandra Daack-Hirsch2

  • 1University of New Mexico, College of Nursing, Albuquerque, New Mexico.

Journal of the American Association of Nurse Practitioners
|July 1, 2026
PubMed
Summary
This summary is machine-generated.

Germline mosaicism, where genetic changes occur in sperm or egg cells, has significant clinical implications. Advances in genetic sequencing now allow for better detection and understanding of this phenomenon, impacting genetic testing and counseling.

Keywords:
Genetic technologiesgenotype–phenotype relationshipsmosaicismvariable expressivity

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Area of Science:

  • Genetics and Genomics
  • Developmental Biology
  • Clinical Medicine

Background:

  • Germline mosaicism, previously underrecognized, is now understood as a common biological occurrence.
  • A recent case highlighted the transmission of pathogenic TP53 variants through sperm donation, underscoring clinical implications.
  • Early observations noted segmental and asymmetric phenotypes, hinting at mosaicism.

Purpose of the Study:

  • To trace the historical evolution of understanding germline mosaicism.
  • To discuss the impact of advanced genetic technologies on mosaicism detection and interpretation.
  • To explore how mosaicism challenges traditional genotype-phenotype relationships and influences clinical practice.

Main Methods:

  • Review of historical clinical observations.
  • Analysis of advancements in genetic technologies, specifically ultra-deep next-generation sequencing.
  • Discussion of the biological and clinical significance of mosaicism.

Main Results:

  • Genetic technologies have significantly improved the detection and understanding of mosaicism.
  • Mosaicism is recognized as a frequent biological phenomenon with diverse clinical relevance.
  • Understanding mosaicism necessitates shifts in clinical thinking regarding genetic testing and counseling.

Conclusions:

  • Germline mosaicism is a critical factor in genetic variation and disease presentation.
  • Accurate detection and interpretation of mosaicism are essential for effective genetic counseling.
  • This work provides a foundation for clinical case studies on managing mosaicism in patient care.