The Y chromosome is one of two sex chromosomes in therian mammals and other organisms. Along with the X chromosome, it is part of the XY sex-determination system, in which the Y is the sex-determining chromosome because the presence of the Y chromosome causes offspring produced in sexual reproduction to be of male sex.

In human genetics, a human Y-chromosome DNA haplogroup is a haplogroup defined by specific mutations in the non-recombining portions of DNA on the male-specific Y chromosome (Y-DNA). Individuals within a haplogroup share similar numbers of short tandem repeats (STRs) and single-nucleotide polymorphisms (SNPs). [2] The Y-chromosome accumulates approximately two …

In human genetics, the Y-chromosomal Adam (more technically known as the Y-chromosomal most recent common ancestor, shortened to Y-MRCA), is the patrilineal most recent common ancestor (MRCA) from whom all currently living humans are descended.

The Y chromosome is a chromosome that decides the sex in most mammals, including humans. It contains the gene SRY , which triggers testis development, so making an animal male or female. Normal females have two X chromosomes, and normal males have one X and one Y.

May 28, 2024 · Among the 24 chromosomes that make up the human genome, the Y chromosome is unique for its highly repetitive structure. Scientists are studying the Y and its unusual features to better understand human health and disease. Most human cells contain 23 pairs of chromosomes.

Aug 23, 2023 · The Y chromosome is one of two human sex chromosomes, the other being the X chromosome. When researchers completed the first human genome sequence 20 years ago, gaps were left in the sequences of every chromosome, and in the race to sequence the human genome, the Y chromosome got left in the dust.

Aug 23, 2023 · Scientists have finally filled the gaps in the sequence of the human Y chromosome, 20 years after the first draft of its DNA code was published. The work reveals a complete catalog of the genes...

Mar 7, 2025 · The Y chromosome is one of the two sex chromosomes that are involved in sex determination. Humans and most other mammals have two sex chromosomes (X and Y) that in combination determine the sex of an individual. Females have two X chromosomes in their cells, while males have one X and one Y. Y chromosome.

The Y chromosome spans more than 59 million building blocks of DNA (base pairs) and represents almost 2 percent of the total DNA in cells. Each person normally has one pair of sex chromosomes in each cell. The Y chromosome is present in males, who have one X and one Y chromosome, while females have two X chromosomes.

Jun 8, 2020 · The Y chromosome is one of the sex chromosomes, the other being the X chromosome. Typically, individuals have a pair of sex chromosomes. Only males have a Y chromosome, and they also have one X chromosome (XY).

Y chromosome microdeletion (YCM) is a family of genetic disorders caused by missing genes in the Y chromosome.Many men with YCM exhibit no symptoms and lead normal lives. It is present in a significant number of men with reduced fertility. [1] Reduced sperm production varies from oligozoospermia, significant lack of sperm, or azoospermia, complete lack of sperm.

The Y chromosome is the most gene-deficient chromosome in the human genome (though not the smallest chromosome) and has largely been sequestered away from large-scale studies of the effects of genetics on human health.

But the human Y chromosome is degenerating and may disappear in a few million years, leading to our extinction unless we evolve a new sex gene. The good news is two branches of rodents have already lost their Y chromosome and have lived to tell the tale.

Aug 27, 2024 · As the world progresses, biologists have shed light on how the Y chromosome, one of the two sex chromosomes in humans, is on the cusp of disappearing. The complete disappearance of this chromosome would mean the end of the male offspring in the future. However, there is some hope.

May 30, 2014 · Many generations ago the Y chromosome was large, and contained as many genes as the X chromosome. Now it is a fraction of its past size and contains fewer than 80 functional genes. This has led to debates and concerns over the years regarding the Y chromosome's eventual destiny.

Haplogroup C is a major Y-chromosome haplogroup, defined by UEPs M130/RPS4Y711, P184, P255, and P260, which are all SNP mutations.It is one of two primary branches of Haplogroup CF alongside Haplogroup F.Haplogroup C is found in ancient populations on every continent except Africa and is the predominant Y-DNA haplogroup among males belonging to many peoples …

Mar 3, 2025 · The Y chromosome, by comparison, is 1/3rd the size of the X chromosome, coming in at about 55 million base pairs, with less than 80 genes that code for proteins, along with another 388 pseudogenes. The larger X chromosome was sequenced faster, and with less sophisticated sequencing technology than what was required for the Y chromosome.

Das Y-Chromosom ist ein Geschlechtschromosom (Gonosom). Es bewirkt die Ausbildung des männlichen Phänotyps. Bei vielen Arten wird das Geschlecht eines Individuums durch eine chromosomale Geschlechtsbestimmung festgelegt.

Haplogroup I (M170) is a Y-chromosome DNA haplogroup. It is a subgroup of haplogroup IJ, which itself is a derivative of the haplogroup IJK.Subclades I1 and I2 can be found in most present-day European populations, with peaks in some Northern European and Southeastern European countries.. Haplogroup I most likely arose in Europe, [1] [2] with it so far found in …

May 24, 2022 · The human Y chromosome is a male-specific sex chromosome. Nearly all humans who possess a Y chromosome will be morphologically male. Although the Y chromosome is situated in the cell nucleus, it only recombines with the X-chromosome at the ends of the Y chromosome; the vast majority of the Y chromosome (95%) does not recombine.

Y2a predominates in the Southeast Asian range of haplogroup Y, which is centered on the Philippines and Sumatra. However, Y2b has been observed in Japan and in a Buryat , and Y2* has been observed in Chinese, Japanese, and Khamnigan samples.

Haplogroup DE is a human Y-chromosome DNA haplogroup.It is defined by the single nucleotide polymorphism (SNP) mutations, or UEPs, M1(YAP), M145(P205), M203, P144, P153, P165, P167, P183. [7] DE is unique because it is distributed in several geographically distinct clusters. An immediate subclade, haplogroup D (also known as D-CTS3946), is mainly found in East …

XY complete gonadal dysgenesis, also known as Swyer syndrome, is a type of defect hypogonadism in a person whose karyotype is 46,XY. Though they typically have normal vulvas, [1] the person has underdeveloped gonads, fibrous tissue termed "streak gonads", and if left untreated, will not experience puberty.The cause is a lack or inactivation of an SRY gene …