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Related Concept Videos

The Y Chromosome Determines Maleness02:19

The Y Chromosome Determines Maleness

The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size. Today,...
Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
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...
Synteny and Evolution02:31

Synteny and Evolution

John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
Around 80 million years ago, the human and mice lineages diverged from the common ancestor. During the course of evolution, the ancestral chromosome underwent...
Chromosomal Theory of Inheritance01:39

Chromosomal Theory of Inheritance

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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Updated: Jun 10, 2026

2D and 3D Chromosome Painting in Malaria Mosquitoes
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Published on: January 6, 2014

[Y chromosome: from evolution to forensics--an overview].

Branka Grsković1, Gordan Mrsić

  • 1Forensic Science Center "Ivan Vucetić", General Police Directorate, Ministry of Interior, Zagreb, Croatia. bgrskovic@mup.hr

Acta Medica Croatica : Casopis Hravatske Akademije Medicinskih Znanosti
|July 27, 2010
PubMed
Summary
This summary is machine-generated.

The Y chromosome, crucial for male sex determination, has evolved significantly from its ancestral state. Its unique genetic makeup and inheritance patterns make Y-STR haplotyping vital for forensic science.

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Area of Science:

  • Genetics
  • Human Evolution
  • Forensic Science

Context:

  • The Y chromosome, homologous to the X chromosome ~300 million years ago, has undergone extensive deletions, reducing its size and gene content.
  • It is primarily composed of heterochromatin, with functional genes concentrated in euchromatic regions and two pseudoautosomal regions allowing limited recombination with the X chromosome.

Purpose:

  • To detail the structural and genetic characteristics of the human Y chromosome.
  • To highlight the significance of Y-chromosome-specific genetic markers, particularly Short Tandem Repeats (STRs).

Summary:

  • The Y chromosome, essential for male development via genes like SRY, is largely heterochromatic and non-recombining, except for pseudoautosomal regions.
  • It is paternally inherited and rich in polymorphic repetitive DNA, including STR loci within the non-recombining region.
  • Y-STR haplotyping analyzes these linked STRs, providing unique paternal lineage profiles.

Impact:

  • Y-STR haplotyping is indispensable in forensic investigations for identifying individuals, establishing paternity, and analyzing male DNA in complex samples.
  • This technique aids in cases involving azoospermic individuals and verification of specific genetic deficiencies.