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A breeder reactor generates (in a way) new fuel, sometimes more fuel than it uses, by converting non-fissionable isotopes into fissionable isotopes, through neutron capture.
Artificial selection is when a human determines how an animal or plant breeds. For example: dog breeding. A breeder will put a male and female dog of the same breed together while the female is in heat in order to get them to breed. S/he chooses a male and female biased on their looks, genetics, and temperament. Natural selection however is when nature determines how an animal breeds. For example: wolves. If the temperature drops below a level which wolves with a thinner coat cannot survive, then they will die and thicker coated wolves survive and breed, resulting in wolf pups with thicker coats.
Selective breeding supports Darwins theory because, we adapt to our environments and believe whoever is compatible with breeding will pass on the trait, even if that means outside their own species.
A breeder reactor is one that is designed to produce more fissionable fuel from material that is not initially fissionable, thus enabling a self-sustaining fuel cycle to be set up so that new supplies of the fissionable U235 are not needed (that is the concept). Note that even the normal thermal (ie moderated slow neutron) type of reactor does breed fuel, in that some of the U238, which constitutes about 95-96 percent of the uranium used, is converted to plutonium. If the fuel is processed after unloading from the reactor, the Pu can be recovered, and a mixed oxide fuel produced (MOX) which contains Pu and U235, for subsequent use in thermal reactors. This has benn done in the UK and France, but in the US this has not been done on any large scale, the used fuel has been and still is being stored on the power plant sites. However the concept of the breeder reactor as a new generation of reactors is aimed at using the fast reactor, that is one in which there is no moderator, the fission chain reaction is maintained by fast neutron fission. This requires a higher enrichment of fuel for its first load, this can be provided by Pu239, which is available from old nuclear weapons which have been taken out of service, and from chemical separation of used fuel as said above. Such a fast reactor can have an outer blanket of U238, which is available as a byproduct of the U235 enrichment process, and during operation neutron capture would convert this to Pu239 (together with higher Pu isotopes). This could then be recovered and used for subsequent fuel charges. Thorium is also a possible breeding material, producing U233. These ideas have been tried in prototypes, some large enough to produce power (Dounreay PFR in UK, Phenix in France), with some technical success, but at the moment it is not commercially attractive, the thermal types of PWR and BWR are still the main intention for new builds, and this will probably continue while U235 supplies are plentiful and reasonably priced. At some fairly distant time the fast breeder may become the preferred commercial option, but not yet.
A geneticist is a scientist who studies heredity (genes, DNA) and variation in organisms. Typically a geneticist analyzes data from experiments or population observations to interpret the inheritance of traits in relation to disease. A geneticist can be a physician who has specialized training in genetics, a genetic counselor, a breeder, or researcher in medicine, ecology, pharmacology, and various other specialities.
Artificial selection, which is analogous to natural selection. The breeder chooses which characteristics are desirable and breeds towards those characteristics.
The best place to start a search for Siberian kittens is at a when known and reputable breeder. A breeder should have a large selection of healthy Siberian kittens available for purchase.
artificial selection
Goldfish can produce over 1000 fry when they spawn this is why it is very important for goldfish breeder's to perform culling (pick out the best specimens and dispose of the rest). Goldfish breeder's usually select around 50-60 fry that appear to have good potential.
When considering the lineage of a potential pet, important pedigree questions to ask include the health history of the parents and any genetic conditions they may carry, the temperament and behavior of previous generations, any titles or awards earned by ancestors, and the breeder's reputation and breeding practices.
The cost of a Bedlington Terrier typically ranges from $1,500 to $3,000, depending on factors such as the breeder's reputation, the dog's lineage, and geographic location. Additionally, potential owners should consider ongoing expenses like grooming, food, and veterinary care. It's important to choose a reputable breeder to ensure the health and temperament of the dog.
The breeder's equation explains how genetic variation influences the selection of desirable traits in breeding programs. It states that the response to selection for a particular trait is determined by the genetic variation for that trait and the strength of selection pressure applied. In breeding programs, breeders aim to increase the frequency of genes associated with desirable traits by selecting individuals with those traits to be parents of the next generation. This process helps to improve the overall genetic quality of the population over time.
Breeder reactors are not widely used in the nuclear power industry due to concerns about safety, high costs of construction and operation, potential for nuclear proliferation, and public perception of nuclear energy.
To find a reputable breeder for a dog in Pennsylvania, you can start by checking with local breed clubs, contacting the American Kennel Club (AKC) for breeder referrals, and researching online reviews and recommendations. It's important to visit the breeder in person, ask questions about their breeding practices, and ensure they prioritize the health and well-being of their dogs.
Treeing Walker Hound puppies typically cost between $300 and $800, depending on factors such as the breeder's reputation, the puppy's lineage, and geographic location. It's important to choose a responsible breeder who prioritizes health testing and proper care. Additionally, consider potential ongoing expenses like vaccinations, training, and grooming when budgeting for a new puppy.
Saarloos Wolfdogs typically range in price from $1,500 to $3,000, depending on factors such as the breeder's reputation, the dog's lineage, and geographical location. It's important to find a responsible breeder who prioritizes health and temperament. Additionally, potential owners should consider ongoing costs like food, grooming, and veterinary care. Always research thoroughly before making a purchase.
Breeder ---> The Shop.