The Scientific Method

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Y Chromosome Evolution Humans

The human Y chromosome is intriguing not only because it harbours the master-switch gene determining gender but also because of its unusual evolutionary trajectory. Previously an autosome, Y chromosome evolution has been characterized by massive gene decay.

Origin. The X and Y chromosomes are thought to have evolved from a pair of identical chromosomes, termed autosomes, when an ancestral animal developed an allelic variation, a so-called "sex locus" – simply possessing this allele caused the organism to be male. The chromosome with this allele became the Y chromosome,

Jan 15, 2010  · The first comprehensive comparison of Y chromosomes from two species sheds new light on Y chromosome evolution. Contrary to a widely held scientific theory that the mammalian Y chromosome is.

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Her research encompasses the evolution of sex chromosomes in Drosophila spp., focusing particularly on processes and molecular mechanisms of Y-chromosome degeneration and dosage compensation of the X.

In a new study in the journal Nature, scientists reconstructed the evolution of the Y chromosome in humans and seven other mammals to find if chance was involved in deciding which genes survived, or.

One striking exception to this pattern of gene distribution is the human Y chromosome. Far from being random and diverse, known human Y-chromosome genes show just a few distinct expression profiles.

Aug 14, 2003  · The Y chromosome is probably the most bizarre part of the human genome, reflecting its unique status as a huge block of largely non-recombining DNA, maintained in a permanently heterozygous state, and transmitted solely through males [1].

Jan 13, 2010  · But the first comprehensive comparison of the Y chromosome in two species–specifically, humans and chimpanzees–shows that in fact, it is a hot spot of evolution.

Other researchers are tracing the evolution of the Y chromosome and comparing the version found in modern men with those of our close relatives, both living and extinct. Takeaway A: We can drop the.

Jan 15, 2010  · The first comprehensive comparison of Y chromosomes from two species sheds new light on Y chromosome evolution. Contrary to a widely held scientific theory that the mammalian Y chromosome is.

Nov 12, 2012  · Guys, Your Y Chromosome Is an Evolutionary Marvel. The evolution of the Y chromosome suggests that human history was less polygamous than previously thought. (Australian actor Chris Hemsworth best known for playing Thor in the Marvel movie of the same name.) SAN FRANCISCO — The Y chromosome may have gotten a bad rap.

Nov 12, 2012  · Guys, Your Y Chromosome Is an Evolutionary Marvel. The evolution of the Y chromosome suggests that human history was less polygamous than previously thought. (Australian actor Chris Hemsworth best known for playing Thor in the Marvel movie of the same name.) SAN FRANCISCO — The Y chromosome may have gotten a bad rap.

Now a new study of one of these species of fruit fly has tracked the evolution of a pair of sex chromosomes that appeared only around a million years ago. The X and Y chromosomes in the fruit fly are,

Hughes and Page theorize that the divergent evolution of the chimp and human Y chromosomes. Whitehead Institute for Biomedical Research. "Chimp and human Y chromosomes evolving faster than expected.

Hammer cautions against popular concepts of "mitochondrial Eve" or "Y chromosome Adam" that suggest all of humankind descended from exactly one pair of humans that lived at a certain point in human.

that little chain of genes that determines the sex of humans, is not as tough as you might think. In fact, if we look at the Y chromosome over the course of our evolution we’ve seen it shrink at an.

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Human Y-chromosome DNA haplogroup. In human genetics, a human Y-chromosome DNA haplogroup is a haplogroup defined by mutations in the non- recombining portions of DNA from the Y-chromosome (called Y-DNA). Mutations that are shared by many people are called single-nucleotide polymorphisms.

The Y chromosome. The human (and most other mammalian species) One of the two sex chromosomes that determines maleness in mammals, carried and passed down from males to males. Y chromosome contains the sex-determining The functional and physical unit.

In many species, the possession of X and Y chromosomes determines whether an individual develops into a male or female. In humans, for example. multiple times and a striking feature of its.

Jan 13, 2010  · But the first comprehensive comparison of the Y chromosome in two species–specifically, humans and chimpanzees–shows that in fact, it is a hot spot of evolution.

Jan 15, 2010  · The first comprehensive comparison of Y chromosomes from two species sheds new light on Y chromosome evolution. Contrary to a widely held scientific theory that the mammalian Y chromosome is.

737 Human evolution and the Y chromosome R John Mitchell* and Michael F Hammer The past two years have seen the increased study of Y-chromosome polymorphisms and their relationship to human evolution and variation.

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The human Y chromosome is intriguing not only because it harbours the master-switch gene determining gender but also because of its unusual evolutionary trajectory. Previously an autosome, Y chromosome evolution has been characterized by massive gene decay.

Washington (AFP) – The first examination of a long-extinct Neanderthal’s Y chromosome suggests that fertility problems may have prevented Neanderthal men from successfully mating with modern human.

. frequency throughout human evolution,” says Wilson Sayres. The new analysis also shows an unexpected peak of genetic diversity in an inverted section of the X chromosome that, in humans, was.

Every cell in the human body contains 23 pairs of chromosomes. Some scientists have argued the Y chromosome is so uniform because throughout evolution, relatively few men passed on their genes.

Jan 15, 2010  · The first comprehensive comparison of Y chromosomes from two species sheds new light on Y chromosome evolution. Contrary to a widely held scientific theory that the mammalian Y chromosome is.

The findings, presented Friday (Nov. 9) here at the American Society of Human. the sex chromosomes in two men will look more alike than other chromosomes do. Some scientists have argued the Y.

(Phys.org) —University of Arizona geneticists have discovered the oldest known genetic branch of the human Y. "Y chromosome Adam" that suggest all of humankind descended from exactly one pair of.

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Hammer cautions against popular concepts of "mitochondrial Eve" or "Y chromosome Adam" that suggest all of humankind descended from exactly one pair of humans that lived at a certain point in human.

that little chain of genes that determines the sex of humans, is not as tough as you might think. In fact, if we look at the Y chromosome over the course of our evolution we’ve seen it shrink at an.

To understand better the recent evolution of the human X-degenerate sequence and the fate of its remaining genes, we determined the nucleotide sequence of the X-degenerate portion of the chimpanzee Y.

Jan 15, 2010  · The first comprehensive comparison of Y chromosomes from two species sheds new light on Y chromosome evolution. Contrary to a widely held scientific theory that the mammalian Y chromosome is.

737 Human evolution and the Y chromosome R John Mitchell* and Michael F Hammer The past two years have seen the increased study of Y-chromosome polymorphisms and their relationship to human evolution and variation.

The findings, presented Friday (Nov. 9) here at the American Society of Human. the sex chromosomes in two men will look more alike than other chromosomes do. Some scientists have argued the Y.

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