Navigation Links
Reproduction


Reproduction is the creation of one thing as a copy of, product of, or replacement for a similar thing, e.g. photocopying and the making of replicas.

It is perhaps most commonly used in the context of biological reproduction and sex:

  • Sexual reproduction is a biological process by which organisms create descendants through the combination of genetic material. These organisms have two different adult sexes, male and female.
  • Asexual reproduction is a biological process by which an organism creates a genetically similar copy of itself without the combination of genetic material with another individual. For example, the Hydra (invertebrates of the order Hydroidea) and yeast are able to reproduce by budding. These organisms do not have different sexes, and they are capable of "splitting" themselves into two or more parts and regrow their body parts. Some 'asexual' species, like hydra and jellyfish, may also sexually reproduce. Most plants are capable of vegetative reproduction. Other ways of asexual reproduction are binary fission, fragmentation and spore formation .

There are a wide range of reproductive strategies employed by different species.

Some animals, like the human (sexually mature after adolescence) and Northern Gannet (5-6 years), produce few offspring. Others reproduce quickly, but unless raised in an artificial environment, most offspring do not survive to adults. A rabbit (mature after 8 months) produces 10 - 30 offspring per year, a Nile Crocodile (15 years) produces 50, and a fruit fly (10-14 days) produces up to 900. Both strategies can be favoured by evolution: animals with few offspring can spend time nurturing and protecting them, hence greatly decreasing the need to reproduce; on the other hand, animals with many offspring do not need to spend parental energy on nurturing, allowing more energy to be devoted to survival and more breeding.

These two strategies are known as K-selection (few offspring) and r-selection (many offspring). Which strategy is favoured depends on a wide range of circumstances.


In Marxian economics, reproduction can refer to the worker's daily reproduction of his own labor capacity. This consists of the tasks of everyday existence — food preparation, laundry and so forth — that maintain him and his ability to show up at his job as required. Much of this domestic labor has historically been the responsibility of women; thus it is of particular interest in feminist economics.

See also

External link



Asexual Reproduction


'"/>


(Date:7/11/2014)... division of the striatum is also involved in ... of substance P in the striatal marginal division ... his team, College of Biophotonics, South China Normal ... P receptor, neurokinin 1 was highly expressed in ... rats. Unilateral or bilateral injection of an antisense ...
(Date:7/11/2014)... Brazil- In the brains of all vertebrates, information ... an electric or chemical signal to be passed ... which are the most abundant type of synapse, ... is crucial for learning, memory, perception and cognition, ... critical for brain function. For instance, every ...
(Date:7/10/2014)... 2014 Smart technology emphasis grows in ... improved security: NXT-ID, Inc. (OTCBB: NXTD), eBay Inc. (NASDAQ: ... Apple Inc. (NASDAQ: AAPL ), Visa Inc. (NYSE: ... NXT-ID, Inc., (OTCQB: NXTD) a biometric authentication company focused on ... second series of 30 second spots on CNBC for its ...
Breaking Biology News(10 mins):Blame it on the astrocytes 2Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 2Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 3Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 4Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 5
... Mass.--MIT engineers and colleagues have built a new tissue ... transplanted into the knees and other joints. The ... injuries and other cartilage damage, such as arthritis, says ... Science and Engineering and co-leader of the research team ...
... of Medical Genetics (ACMG) has issued a new Position ... Spots. In May 2006, ACMG recommended that all newborns ... Tremendous progress has been made in,implementing broader and more ... thousands of babies, lives have been saved or have ...
... of how the elevated glucose levels that occur in ... for blocking the destruction, Medical College of Georgia researchers ... vessels to relax resulted from increased activity of a ... Dr. Rita C.Tostes, physiologist in the MCG School of ...
Cached Biology News:MIT: New tissue scaffold regrows cartilage and bone 2American College of Medical Genetics affirms importance of newborn screening dried blood spots 2New evidence of how high glucose damages blood vessels could lead to new treatments 2
Other biology definitionOther Tags