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Related Concept Videos

Polytene Chromosomes02:04

Polytene Chromosomes

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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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Chromosome Structure02:40

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A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...
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Chromosome Replication02:31

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Before a cell can divide, it must accurately replicate all of its chromosomes, including the DNA and its associated histone and non-histone proteins.  This process begins at numerous origins of replication during the S phase of the cell cycle in each of a cell’s chromosomes simultaneously. Certain nucleotides can act as origins of replication, but these sequences are not well defined - especially in complex, multi-cellular, eukaryotic species. The length of DNA that spans an origin...
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Lampbrush Chromosomes01:51

Lampbrush Chromosomes

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In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
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Chromosomal Theory of Inheritance01:39

Chromosomal Theory of Inheritance

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In 1866, Gregor Mendel published the results of his pea plant breeding experiments, providing evidence for predictable patterns in the inheritance of physical characteristics. The significance of his findings was not immediately recognized. In fact, the existence of genes was unknown at the time. Mendel referred to hereditary units as “factors.”
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X and Y Chromosomes02:32

X and Y Chromosomes

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Among mammals, the gender of an organism is determined by the sex chromosomes. Humans have two sex chromosomes, X and Y. Every human diploid cell has 22 pairs of autosomes and one pair of sex chromosomes. A human female has two X chromosomes, while a male has one X chromosome and one Y chromosome.
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...
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Related Experiment Video

Updated: Jan 26, 2026

Chromosome Screening of Human Preimplantation Embryos by Using Spent Culture Medium: Sample Collection and Chromosomal Ploidy Analysis
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[Chromosome analysis using image processing. Recent aspects and perspectives].

P Malet1, A Geneix, P Bonton

  • 1Laboratoire de Cytogénétique, Faculté de Médecine, Clermont-Ferrand.

Annales De Genetique
|January 1, 1989
PubMed
Summary
This summary is machine-generated.

This study introduces an interactive chromosome analysis method using automatic edge delineation and high-resolution imaging for accurate classification. The Chromoscan system offers improved quantitative studies and expert system integration for enhanced karyotyping.

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Chromosome Screening of Human Preimplantation Embryos by Using Spent Culture Medium: Sample Collection and Chromosomal Ploidy Analysis
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Area of Science:

  • Genetics
  • Computational Biology
  • Medical Imaging

Context:

  • Current automatic metaphase finding and karyotyping systems have limitations.
  • Accurate chromosome analysis is crucial for genetic diagnostics.

Purpose:

  • To describe an interactive method for chromosome analysis.
  • To detail the technical specifications enabling accurate classification.
  • To highlight system improvements for advanced karyotyping.

Summary:

  • An interactive chromosome analysis method is presented, featuring automatic edge delineation.
  • High-resolution imaging (256 grey levels, 512x512 pixels) ensures precise classification.
  • Results can be recorded on various media, with enhancements including histograms, quantitative studies, and an expert system.

Impact:

  • Facilitates more accurate and efficient genetic analysis.
  • Provides a foundation for improved diagnostic tools in cytogenetics.
  • Enhances the capabilities of karyotyping systems through advanced features.