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Evolution
The scientific theory according to which populations change gradually through a process of natural selection.
5,264 Questions
Darwins theory of evolution did not contain the concept that?
Genetic variations are produced by mutations and sexual recombination
Natural selection leads to changes in both the physical appearance and what of a species?
And changes in allele frequency of populations; genes in genomes.
Also in the behavioral repertoire of species.
How has the early stages of development in embryos evidence of evolution?
stoned monkeys rule the world
Punctuated equilibrium interprets speciation as occurring how?
Rapidly in the development of new,beneficial traits, followed by very long periods of little change
What is adaptation and evolution?
"adapted" means modified or changed or adjusted to make more suitable.
Example.
The man adapted a lawnmower engine to use to power his go-cart.
What is dragon - ball evolution about?
Dragon Ball Evolution is set in: Dragon Ball - Demon King Piccolo Saga.
Even though its not from the actual storyline, It's about a Teenager named Goku being trained by his Grandpa Named Gohan. However on his 18th Birthday, Grandpa Gohan is killed by Piccolo and Goku seeks revenge.
What important element of evidence or observation did Darwin's theory of evolution lack?
A mechanism of heredity. Darwin's concept, panspermia, was based on a blending of factors he called gremules that originated with either sex and were in the blood. This was shown to be completely wrong by Mendel's work on particulate inheritance.
Why do you talk about evolution as a theory not a fact?
In common usage, "theories" are problematic. If I say that "in theory" something is so, you immediately know that I'm not all that sure. There is question.
Scientists use the word in an entirely different context. A scientific theory is an attempt to describe, as accurately as possible, a body of fact that exists independently of the theory. Keep this firmly in mind: good theories explain reality; poor theories bend reality to fit the theory.
Because, Evolution is not a "fact" it is technically just a theory. A theory, in the scientific community, is much more than the generalized term it has become in every day conversation. While evolution is extremely well supported it isn't necessarily treated as a fact because it cannot be implicitly proven despite the great evidence in it's favor. Furthermore, to explain just how much weight a theory holds I'll list some examples which are common to most people Gravity, is technically just a theory even if you experience it all your life. Germ theory (the idea that pathogens and microbes cause illness in individuals), is technically just a theory even though germs causing disease have been isolated and proven to cause disease in other organisms. Cell theory, which states that all living organisms are made of cells, is technically just a theory even though you can observe these cells under a microscope. The reason that these very well established 'facts' (to use it in a liberal fashion) are called 'theories' in science is because scientific 'theory' has a different meaning from a 'theory' in everyday life, which is more accurately called a hypothesis or a conjecture. A scientific theory is a hypothesis that has held under the pressure of testing by countless scientists with different methods and can explain a natural phenomenon exceedingly well. It is as close to a 'fact' as it gets in the scientific community.
What is an acquired characteristic?
Say you go to the gym and work out many years with the free weights and develop a Mr Universe physique. That is an acquired characteristic. Not every one can go to the gym and attain such a sculpted physique as some variations of humans are genetically and developmentally better prepared to do this, not to mention the environmental circumstances; from living in an area with good gyms to having the money to have a gym membership. This potential is the heritable trait.
An acquired characteristic is something that an organism can acclimatize to during a lifetime but can not pass on to progeny. Only genetic changes in the germ line can be passed on to progeny.
Natural selection (survival of the fittest) means that valuable adaptations and mutations have the greatest number of surviving descendants.
Where is Tiktaalik and is it open to be viewed by the public?
Key finds, especially if they are rare specimen, are not usually themselves put on public display. Rather, casts are made and distributed to researchers and musea around the world, while the fossils themselves are kept secure in laboratoria and archives, in a controlled climate.
Casts of Tiktaalik may be found in various natural history musea, such as the Harvard Museum of Natural History.
Can someone help you compare and contrast natural selection and evolution any help would be great?
Evolution is simply genetic change within a poulation. That change can occur in several ways. One is immigration/emigration: individuals moving in or out of a population bring in or take out their alleles with them. Another is genetic drift, or chance events which cause the frequencies of alleles in a population to fluctuate. New mutations can change the allelic frequency as well. Finally, natural selection can cause some alleles to become more common at the expense of others. In short, natural selection is one of several mechanisms that can bring about evolution.
Why evolution should not be equated with progress?
Evolution is simply the generation of diversity and the shaping of the diversity by environmental selection. Species adapt to the conditions available in their environment. Some older and simple species live on quite effectively. The only progressive trend in evolution seems to be that more and more complex body designs have emerged over time.
In fact, one of the simplest life forms like bacteria - inhabit the most inhospitable habitats like hot springs, deep-sea thermal vents and the ice in Antarctica.
This is the reason why evolution in not equated with progress.
What is transfer of the water from leaves of plants into the air is called?
Transpiration - see here
http://en.wikipedia.org/wiki/Transpiration
Describe 2 hypothesis for the evolution of play behavior?
Practice Hypothesis- playing is a type of learning that allows animals to perfect behaviors needed in functional circumstances, such as a kitten stalking brothers and sisters which it will do later in life.
Exercise Hypothesis- playing keeps muscular and cardiovascular systems in top conditions, esp. when young aren't doing strenuous activity to keep active. Recent studies, however, have shown that beluga whales and multiple dolphin species play as adults, at least when in captivity.
What did bilateral symmetry lead to the evolution of?
It allows different parts of the body to become specialized in different ways. This is called cephalization.
1 . The animals are bilaterallysymmetrical , triploblastic and have coelem .
2 . They have a notochord , at least some stages during their lives . The notochord run along the back of the animal separating the nervous tissue from the gut . It provides support and a place for muscles to attach .
3 . Protochordates are marine animals . Examples are Balanglossus , Herdemania , Amphioxus , etc
the actions of organisms as they use or fail to use body structures.
What are the five main items used to support the theory of evolution?
I don't know about there being five things used in favour of evolution, but there are many nonetheless. Below are some supports for Darwin's Theory of Evolution.
Comparative anatomy: The bones of vertebrate forelimbs are 'homologous'. They have common ancestry. You can identify the same bones in the hand of a bat as there are in the hand of a human, the leg of a horse, the flipper of a whale or the paw of a cat. Evolution does not start from scratch all the time but adapts what is already present. Thus once evolution was equipped with forelimb bones, it simply stretched them to support a wing (in bats), strengthened them for beating down water (in whales) or warped their agility to the gripping ability of a human hand.
There are also 'vestigial' anatomical structures which are seen as very convincing of evolution. Whales evolved from hoofed terrestrial herbivores. Whales have foreflippers but not hindflippers. There are however vestigial bones in the hindquarters, which are the left overs of the ancestral terrestrial artiodactyl. Pythons are snakes (thus legless) but evolved from limbed lizards (varanids may be the closest lizard relatives to snakes). Pythons have vestigial hindlimb bones too.
Comparative genetics: Modern science can, incredibly, sequence whole sections of an organism's genome or indeed the whole genome. The genome is composed of DNA, and what is 'sequenced' are the bases of that DNA. DNA bases are abbreviated A, T, C and G. Say you select a frog, a snake and a dog as representatives of amphibians, reptiles and mammals. Now you sequence a gene that each of them share and compare the sequences.
Hypothetical sequences:
Dog: AAAGCGGGGTAG
Snake: AAAGCCGGGTAC
Frog: AAGCCCCGGAAC
You would expect the sequences to show a pattern like the one above, where the most sequence differences are between most distantly related organisms. Evolution would predict that a dog is more closely related to a snake than to a frog. If you come up with a sequence like the above, there are a greater number of AGCT (base) differences between the dog and the frog than between the dog and the snake. This would confirm the idea that snakes and dogs are more closely related than frogs and dogs. Such sequencing has been done and the results have confirmed all of the Theory of Evolutions's predictions.
The fossil record: The fossil record provides many extinct transitions between major taxa. Archaeopteryxrepresent a reptilian-avian transition. Tiktaalik and Icthyostega and relatives give clues as to the sarcopterygian-amphibian transition. Early hominid skulls are representations of transitions from Australopithecus and early Homo to our present species Homo sapiens.
There are also modern (extant) animals and plants that give clues as to transitions. These extant examples are remnants of lineages of ancient organisms that have survived to the present. Platypuses show the reptilian-mammalian transition. Some plants like Welwitschia and other gnetophytes give clues to gymnosperm-angiosperms transitions.
Additionally there is a lot of molecular and chromosomal work done. Origins of species are sometimes demonstrated by this investigation. Apparently an single species of Aethomys mouse was investigated and it was found that the sperm cells of one group were incompatible with the egg cells of another. The two groups were sympatrically and reproductively isolated and were thus separate species.
Chromosomes can fuse together. This reproductively isolates populations and thus promotes speciation. Chromosomes fused somewhere in the lineage between the Chimpanzee-Human common ancestor and modern Homo sapiens. Chromosomes fuse and split all over the place across the animal kingdom. Plant chromosomes merge due to imperfect meiosis probably and produce nondiploid polyploid individuals. All of this promotes reproductive isolation and thus speciation and speciation is the way evolution makes progress.
How do you install moonshell for the cyclods evolution?
FOR ME IT ONLY WORKED WHEN I PUT IT INTO THE SAME AREA AS THE ROMS ON MY MICRO SD CARD, NOT WHERE IT SAYS TO PUT IT ...I.E IN THE ROOT FILE
What is the overriding political question through the evolution of congress?
The distribution of powers within Congress.
What is an interplanetary theory?
An interplanetary theory is a speculative concept or hypothesis that seeks to explain phenomena or patterns observed between planets in a solar system. It may involve studying gravitational interactions, orbital dynamics, or planetary influences on each other's behavior. These theories are often used in astronomy or astrophysics to understand the relationships and movements of different celestial bodies within a solar system.
