News tagged with sperm cells
From embryonic stem cells, a sperm replacement and easier path to genetic modification
Researchers reporting in the April 27 issue of the journal Cell have devised a new and improved method for producing genetically modified animals for use in scientific research. The method relies on haploi ...
Apr 26, 2012 |
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Ovastacin cuts off sperm binding
A study in The Journal of Cell Biology describes how a secreted enzyme helps egg cells avoid being fertilized by more than one sperm.
Apr 02, 2012 |
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Secret of sperm quality control revealed
Yale researchers have discovered how the "guardian of the genome'' oversees quality control in the production of sperm — and perhaps in many other cells as well.
Feb 16, 2012 |
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Without second wave of brown fat, young mice can't live without mama
For all those who have wondered where they'd be without their mothers, a study reported in the February Cell Metabolism puts a whole new spin on the question. Mice whose mothers pass along a mutant copy of a single imprin ...
Feb 07, 2012 |
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Parental controls on embryonic development?
When a sperm fertilizes an egg, each contributes a set of chromosomes to the resulting embryo, which at these very early stages is called a zygote. Early on, zygotic genes are inert, so embryonic development is largely controlled ...
Dec 01, 2011 |
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A new role is hatched for female fruit flies
A team of New York University biologists has uncovered a previously unknown role for a set of cells within the female reproductive tract of fruit flies that affects the functioning of sperm and hence fertility. Their discovery, ...
Nov 08, 2011 |
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Scientists discover important step in sperm reprogramming
When sperm meets egg, the chemical instructions that tag sperm cells must be erased so that human life can start anew. One way these instructions are erased is through demethylation, the removal of specific ...
Sep 22, 2011 |
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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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The long and short of sperm tails
A team of biologists in Japan has uncovered an unexpected role for mitochondria1, the power houses of cells, in the development of sperm in the fruit fly Drosophila melanogaster.
Aug 05, 2011 |
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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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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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Biologists discover 'control center' for sperm production
Biologists at the University of Leicester have published results of a new study into the intricacies of sex in flowering plants.
Feb 02, 2011 |
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Antioxidants may improve chances of conceiving in male subfertility
Antioxidant supplements may benefit couples who have difficulty conceiving naturally, according to a new systematic review published today in The Cochrane Library. The review provides evidence from a small number of trials ...
Medicine & Health / Medical research
Jan 19, 2011 |
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Mildew-resistant and infertile
Two proteins involved in powdery mildew infection in plants also play an important role in fertilization.
Nov 24, 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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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.
