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Related Concept Videos

The Ratio of X Chromosome to Autosomes02:45

The Ratio of X Chromosome to Autosomes

In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.  
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Pedigree Analysis01:35

Pedigree Analysis

Overview
Pedigree Analysis01:35

Pedigree Analysis

Overview
X and Y Chromosomes02:32

X and Y Chromosomes

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...
X-linked Traits01:19

X-linked Traits

In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
X-linked Traits01:19

X-linked Traits

In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.

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Related Experiment Video

Updated: Jun 27, 2026

Combined Immunofluorescence and DNA FISH on 3D-preserved Interphase Nuclei to Study Changes in 3D Nuclear Organization
13:55

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Kinship testing with X-chromosomal markers: mathematical and statistical issues.

Michael Krawczak1

  • 1Institut für Medizinische Informatik und Statistik, Christian-Albrechts Universität Kiel, Brunswiker Strasse 10, 24113 Kiel, Germany. krawczak@medinfo.uni-kiel.de

Forensic Science International. Genetics
|December 17, 2008
PubMed
Summary
This summary is machine-generated.

X-chromosomal markers are crucial for accurate kinship testing, especially when considering complex relationships. Accounting for linkage disequilibrium between markers ensures reliable genetic evidence in forensic and genealogical analyses.

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Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry
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Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry

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Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry
05:53

Candidate Gene Testing in Clinical Cohort Studies with Multiplexed Genotyping and Mass Spectrometry

Published on: June 21, 2018

Area of Science:

  • Forensic Genetics
  • Human Genetics
  • Population Genetics

Background:

  • Kinship testing relies on analyzing shared genetic material between individuals.
  • X-chromosomal markers offer unique advantages for tracing paternal lineages and complex family relationships.
  • Accurate interpretation requires understanding allele sharing probabilities under different relationship hypotheses.

Purpose of the Study:

  • To outline the principles of using X-chromosomal markers in kinship testing.
  • To emphasize the importance of considering linkage and linkage disequilibrium for accurate genetic evidence.
  • To highlight methods for calculating likelihood ratios in complex pedigree analyses.

Main Methods:

  • Utilizing identical-by-descent allele sharing probabilities.
  • Applying likelihood ratio tests to genotype data.
  • Incorporating linkage and linkage disequilibrium patterns between X-chromosomal loci.
  • Employing software like "LINKAGE" for exact likelihood calculations on complex pedigrees.
  • Generating genetic maps from public physical location databases.

Main Results:

  • X-chromosomal marker analysis is most informative when allele sharing probabilities differ between hypotheses.
  • Likelihood ratios derived from genotype data are essential for optimal decision-making.
  • Ignoring linkage and linkage disequilibrium can lead to misleading genetic evidence.
  • Exact likelihood calculations are feasible for complex pedigrees using specialized software.

Conclusions:

  • X-chromosomal markers provide valuable data for kinship testing, particularly in complex scenarios.
  • Accurate kinship testing necessitates accounting for genetic linkage and linkage disequilibrium.
  • Computational tools facilitate robust genetic evidence analysis in forensic and genealogical contexts.