News tagged with sperm cells
Japanese sperm cell breakthrough offers hope to infertile men
(PhysOrg.com) -- In what can only be described as cosmic forces at work, Japanese scientists working at Yokohama University, just south of Tokyo, have in the midst of a national crises, announced a major breakthrough in fertility ...
Mar 24, 2011 |
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Sea lampreys jettison one-fifth of their genome
(PhysOrg.com) -- Researchers have discovered that the sea lamprey, which emerged from jawless fish first appearing 500 million years ago, dramatically remodels its genome. Shortly after a fertilized lamprey ...
Jul 20, 2009 |
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Size did matter -- evidence of giant sperm found in microfossils
The mystery of giant sperm present in some living animal groups today has now taken on a new dimension -- in one group of micro-crustaceans new evidence shows that it is a feature at least 100 million years ...
Jun 18, 2009 |
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Analysis knocks down theory on origin of cell structure
(PhysOrg.com) -- Understanding how living cells originated and evolved into their present forms remains a fundamental research area in biology, one boosted in recent years by the introduction of new tools ...
Apr 22, 2009 |
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Non-hormonal contraceptive a future possibility
(PhysOrg.com) -- Researchers from the University of California, San Francisco and the Center of Advanced European Study and Research in Bonn, Germany published simultaneous papers this week in Nature which could ...
Medicine & Health / Medical research
Mar 17, 2011 |
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The egg makes sure that sperm don't get too old
In contrast to women, men are fertile throughout life, but research at the Sahlgrenska Academy, University of Gothenburg, Sweden, has now shown that a fertilising sperm can get help from the egg to rejuvenate. The result ...
Mar 25, 2009 |
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Is this the beginning of the end of plant breeding?
No human is a clone of their parents but the same cannot be said for other living things. While your DNA is a combination of half your mother and half your father, other species do things differently. The advantage of clonal ...
Jun 09, 2009 |
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Jumping genes discovery 'challenges current assumptions'
Jumping genes do most of their jumping, not during the development of sperm and egg cells, but during the development of the embryo itself. The research, published this month in Genes and Development, "challenges standard assump ...
Jun 12, 2009 |
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Putting the squeeze on sperm DNA
(PhysOrg.com) -- In the quest for speed, olympic swimmers shave themselves or squeeze into high-tech super-suits. In the body, sperm are the only cells that swim and, as speed is crucial to fertility, have ...
Sep 30, 2009 |
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Unlocking the key to human fertility
Scientists at Leeds and Bradford have discovered a unique 'DNA signature' in human sperm, which may act as a key that unlocks an egg's fertility and triggers new life.
Aug 03, 2009 |
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Researchers identify regulator of human sperm cells
UCSF researchers have identified an elusive molecular regulator that controls the ability of human sperm to reach and fertilize the egg, a finding that has implications on both treating male infertility and preventing pregnancy.
Feb 04, 2010 |
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Spontaneous mutations important cause of mental retardation
New research by Dutch geneticists affiliated with the Radboud University Nijmegen Medical Centre demonstrates that spontaneous mutations are an important cause of mental retardation. The majority of mental retardation is ...
Nov 21, 2010 |
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The machinery for recombination is part of the chromosome structure
During the development of gametes, such as egg and sperm cells in humans, chromosomes are broken and rearranged at many positions. Using state of the art technology, the research group of Franz Klein, professor for genetics ...
Aug 09, 2011 |
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Human sperm created from embryonic stem cells (Update)
(PhysOrg.com) -- Human sperm have been created using embryonic stem cells for the first time in a scientific development which will lead researchers to a better understanding of the causes of infertility.
Jul 08, 2009 |
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Researchers make stem cells from developing sperm
The promise of stem cell therapy may lie in uncovering how adult cells revert back into a primordial, stem cell state, whose fate is yet to be determined. Now, cell scientists at the Johns Hopkins University School of Medicine ...
Aug 06, 2009 |
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Spermatozoon
A sperm, from the ancient Greek word σπέρμα (seed) and ζῷον (living being) and more commonly known as a sperm cell, is the haploid cell that is the male gamete. It joins an ovum to form a zygote. A zygote is a single cell, with a complete set of chromosomes, that normally develops into an embryo.
Sperm cells contribute half of the genetic information to the diploid offspring. In mammals, the sex of the offspring is determined by the sperm cell: a spermatozoon bearing a Y chromosome will lead to a male (XY) offspring, while one bearing an X chromosome will lead to a female (XX) offspring (the ovum always provides an X chromosome). Sperm cells were first observed by Anton van Leeuwenhoek in 1677.
For more information about Spermatozoon, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
