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:7/22/2014)... of Standards and Technology (NIST), working with the ... for analyzing biological cells and tissues based on ... is an advanced form of the widely used ... that are 10,000 times stronger than obtained from ... obtained from comparable "coherent Raman" instruments, and uses ...
(Date:7/22/2014)... as disease causing agents, some viruses can perform ... shape the world we live in today, according ... of Microbiology. , "Viruses participate in essential Earth ... planet, from contributing to biogeochemical cycles, shaping the ... Marilyn Roossinck of Pennsylvania State University, a member ...
(Date:7/22/2014)... Stem cells offer much promise for treating damaged organs ... survival is poor, limiting their effectiveness. New methods are ... optimize their therapeutic function after transplantation, as described in ... a peer-reviewed journal from Mary Ann Liebert, Inc., publishers. ... Open Access website . , In ...
Breaking Biology News(10 mins):Enhanced NIST instrument enables high-speed chemical imaging of tissues 2Enhanced NIST instrument enables high-speed chemical imaging of tissues 3Report on viruses looks beyond disease 2
... key to the blinding effects of diabetic retinopathy is ... Georgia researchers said. Interleukin-6, known to contribute ... helps ignite inflammation of the retina, a first step ... blindness is working-age adults, MCG researchers reported online in ...
... of dollars each year on exotic smelling perfumes and lotions ... a new study in Psychological Science , a journal ... be the best way to capture a potential mate,s attention. ... habits: Animal studies have shown that male testosterone levels are ...
... Malaga have created the ,Inventory of Daily Stressors, a ... physical appearance, taking part in numerous extracurricular activities and ... that increase the risk of suffering from childhood stress. ... to assess daily stress amongst schoolchildren", Mara Victoria Trianes, ...
Cached Biology News:Discovery points toward anti-inflammation treatment for blinding disease 2A new method to measure childhood stress 2
Other biology definitionOther Tags