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Evolution

Parent Category: Biology
The scientific theory according to which populations change gradually through a process of natural selection.

Subcategories

If you're referring to the David Duchovney and Julianne Mooremovie: A firefighting cadet, two college professors, and ageeky-but-sexy government scientist work against an alien organismthat has been rapidly evolving ever since its arrival on Earthinside a meteor.
Horses that run faster don't get caught, so faster horses are more common now than in the early stages. Nij means that horses that run faster than predators live longer to reproduce more and raise colts that can run faster.
Evolution was not discovered . It started as an explanationby Charles Darwin, in 1838, to explain the differences betweenanimals on the mainland with animals he encountered on islands thatwere VERY similar with their mainland cousins but had modifiedtraits and characteristics to allow them to...
The theory of endosymbiosis states that eukaryotic cells evolvedwhen some prokaryotes were engulfed by others and avoided beingdigested. The theory states that chloroplasts developed fromphotosynthetic bacteria and mitochondria from aerobic bacteria. Evidence in support of the endosymbiotic theory...
The fossil record reveals relatively gradual changes in speciesover time. For example, the earliest horses had three toes and acurved spine, and were quite small. Over millions of years theouter toes migrated up the leg and fused with the leg bone. Theteeth changed from browsing on leaves and twigs...
A gradient is the mixture of two or more colours in a fixed unit.It is used in photos to bring a good look or focus in the subjectof the photo. Two or more colours are mixed together with another familiar colourto improve the phenomenon of collision between any two selectedcolours.
I am aware of the following notions regarding the rate ofevolution: . Gradualism , that the rate of evolution is more or lessuniformly gradual. . Punctuated equilibria , that evolution is gradual, butpunctuated by rapid fluctuations in rate of progression. . Saltationism , that new species can...
No. Generally, people believed in blending inheritance ie something from each parent blended or mixied together in the offspring. The fact that inheritance is particulate ie particles (now called genes) are passed from parent to offspring and remain separate from each other, was not known until...
no if they did we would know .
Averaged out at about six million years ago when we split from the chimpanzee branch.
This recessive mutation is one amino acid difference in an allele of hemoglobin. The mutation causes the red blood cell to crenelate and is very debilitating and eventually fatal in homozygous recessive condition. The heterozygous condition confers some advantage in malaria country, especially to...
Scientists do not prove things and truth is always provisional; unless you are an ideologue. That said, evolution is a fact and the theory of evolution by natural selection explains a great deal about that fact, in a internally consistent way and supported by mountains of many lines of converging...
please research this more, but by the very nature of the words in your question, we can assume the answer. Evolution is the changing of a species to better suit its surroundings or habitat (in a rough sense). Divergence is splitting apart and convergence is coming together. So we can assume that...
It is a combination of both. Some members of a population survive by necessity more often, and it is by chance that they have the characteristics enabling to do so.
There several that come to mind since this is a very large subject:Galileo, who said that the sun was the center of the solar system.Another is Steven Hawking who is still trying to find a Theory ofEverything but he did predict the existences of Black Holes andWarm Holes.
No. Because ' survival of the fittest ' is a highly inaccurate concept that is not considered empirically supportable. Fit individuals die; populations evolve by expressing the traits passed on by fit individuals. That fitness is environmentally in context dependent and a phrase like ' survival of...
Through evolution. There are two main kinds of evolution which are gradualism and punctuated equilibrium. In gradualism, natural selection slowly removes unfavorable traits for the environment that the species is living in. After many years the different habitats will result in two species. This...
Genetic drift is an evolutionary process that makes alleles to variate, disappear or appear in offspring from parents, independently of environment. as you can say that you want to randomly distribute 10 colored balls "represent organisms in population"5 pink, 5 blue "alleles" from a pool "parents"...
Rapid environmental change results in rapid evolutionary change (as long as it doesn't occur too fast, in which case the organsisms will simply die out). Also the disappearance of the dominant organisms (eg dinosaurs) leaves an empty space in the ecosystem and the remaining organisms will evolve...
One of the most significant developments in the history of plantlife was the incorporation of chloroplasts into the basaleukaryotic cell. This likely began as a form of endosymbiosis, andevolved into a situation in which chloroplasts and their planthosts are completely co-dependent.
Lamarck proposed that traits acquired during one's lifetime could be passed to the next generation.
Proteins reflect DNA sequences, so scientists study proteins to look for genetic similarities and differences in organisms.
Humans have tail bones are are vestigial. When humans stopped using tails, over several generations, they began to shrink, and now we are left with tail bones. However, there have been cases of people who were born with vestigial tails several centimeters long. An example of a vestigial organ is...
It acts in the same way as natural selection. If artificial selection is continued for long enough, the organisms will become so different that they can't produce fertile offspring (they're different species).
Proteins reflect DNA sequences, so scientists study proteins to look for genetic similarities and differences in organisms.
Scientific evidence suggests that life began on Earth approximately 3.5 billion years ago. The Earth formed 4.5 billion Years ago. The Earth was a dead planet for about 1 billion years. Some evidence would suggest that the first forms of life began more like 3.8 billion years ago, in which...
people saw and realized through plant hybridization that there could be change throughout the species.
Plate tectonics. As the continents broke apart, the organisms on the continents drifted with them. That's why Gondwanian and Laurasian fauna are still decidedly different.
His theory was that as an organism use/disuses a body part, it willgrow larger/smaller. This theory has been proved wrong and Darwin'stheory of descent with modification is what is accepted today.
Almost any animal you can name is evolving to some degree. However, specific examples include AIDS and influenza, which are constantly evolving at a rate we can discern, as do most bacteria and viruses.
Changes that occur as a society acquires new technology.
No arguments; evidence. 1. The biochemical and genetic relatedness of all organisms on earth. 2. Biogeography. The distribution of organisms best explained by evolution. 3. Homology. The bones in your arm match almost bone for bone the bones in your dogs forelimb. ( save for structural...
They would expect to find, and have found: . Related species should be found in close proximity if they evolved from a single parent species, whereas a single act of Special Creation ought to have placed the species anywhere on the globe where the environment was suitable . Evidence that the...
There is no "end game" in natural selection; this is because circumstances change over time and what might be best for one generation might not be so great for another generation. Also, natural selection is usually referred to in terms of "deep time" or hundred of thousand of years. So in comparison...
Fast food is a fad among kids
Yes, evolution has been proven true. Richard Lenski has been very precisely observing twelve cultures of E. coli bacteria since 1988 and has documented multiple occurrences of new genes appearing in the DNA of those bacteria. _____________________________________________________ ...
A geographic barrier eg mountain range, river, ocean, desert, can split a species into two populations which can no longer mix with each other. By splitting up a species into two separate populations a geographic barrier can lead to the formation of a new species. The two separate populations...
Though Darwin was basically correct the theory of evolution by natural selection is no longer " Darwin's theory. " In the 151 years since Darwin first postulated the theory it has become so well supported by additional evidence and reformulations that over 90% of all scientists accept the theory and...
Perhaps you can't, but carbon dating is not used on mineralized fossils. The igneous rock above and below the fossil strata is radiometricly dated, Carbon dating is only good on material containing carbon; material less than 40,000 years old.
Mutation and natural selection.
No. Genetics is the study of how characteristics are inherited. Evolution is the study of how species originate and change through time. Evolution only works on inherited characteristics ie genetic varoiation, so the two subjects are intimately related, but they are not the same.
Darwin's theory has little to do with criminology. Were you thinking of the study of evolution or perhaps forensic anthropology? The last one is very important because when a body is not found a long time after that person's death, more information can be gained about the person's identity and cause...
Interesting question. Perhaps. The transposon that landed in the middle of a gene, disrupting it or changing its expression could be very important. The mutations they cause seem to be stable and we have had them with us a very long time.
Natural selection select depending on 2 things. 1. The ability to survive in a habitat until reprocing 2. The ability to reproduce and to get a mate
yes. if they are not needed the animals either lose them, change them, or die out.
You seem confused about what is meant by evolution and what is meant by speciation. Scientist do not prove things, but they do support their claims with evidence.
It's genetic, and recessive - get a test to see if you're a carrier. If you already have it than wait until gene manipulation becomes common.
Charles Darwin basically stated the following on his theory of evolution: . Inherited variation exists within the genes of every population or species (the result of random mutation and translation errors) . In a particular environment, some individuals of a population or species are better suited...
The 3 types of animal adaptations are. . . Behavioral= responses made by an organism in any situation. Physiological= characteristics of a healthy organism, or normalfunctioning of the body. Structural= organic structure.
The idea of evolution was thought of long before Darwin, by a man named Count Buffon. What Charles Darwin did was to successfully come up with the mechanism of evolution, known as natural selection.
Skull can provide an amazing amount of evidence of the anatomicalchanges that have occurred in hominids over time. Observations ofthe size of the skull can give us clues on how much the brain hasevolved.
Due to environmental changes the organisms need to adapt accordingto the changing environment, and thus it leads to survival offittest which is nothing but the natural selection.
No. Molecular genetics is the strongest evidence for evolution. Comparison of chimp and human genomes for instance.
I think you are looking for reptiles .
Evolution, the change in allele frequency over time in a populationof organisms, is a fact. Show evidence that this does not happen. Ithink you would find that very difficult to show since change inallele frequency is so easy to observe. Now, to show that the theory of evolution by natural selection...
Some still have embedded pelvises under a good bit of blubber.
If you are referring to the central notions of evolutionary theory in biology, then this "core" can be summarized in a few simple theses: 1. That life forms reproduce with variation. 2. That variations compete for resources. 3. That this competition affects the rates of spread of inherited...
The concept of unifomitarianism.
Allow me to show you the evolution of classical music.
Better known as "adaptive radiation", it is independent evolution from a population of a species that has become geographically isolated from its parent population.
I think you mean genetic drift. Genetic drift is not strong enough in itself to cause speciation generally. Genetic drift is merely a sampling error in allele frequency change due to random events.
Evolution is change over time in a population of organisms. Formal and impressive to teacher definition is this; ' Evolution is the change in allele frequency over time in a population of organisms. '
Here is one. Chromosome number two in humans is the result of head to head fusion of two chimpanzee chromosomes. The genes along these chromosomes are very, very similar in form and expression and the number two chromosome has telomere material in the middle and two centromeres. ( one inactivated )...
a population of salmon with different skin colors that attract mates
Only natural selection could be the answer here as natural selection is the main driver of adaptive change leading to evolutionary change and speciation in large populations.
A rare isotope of carbon (carbon 14) is breathed in by organisms on average by size and gas exchange metabolism. The do not start breathing it until birth and stop ingesting the isotope at death. So, by examining the organisms you get a good estimation of length of life and then know rather closely...
. Natural selection is what is said to be the principal cause ofevolution.
It changed over time from black and white to color?
increased survival rates of gametophyte as it is enclosed within a sterile jacket of cells ... also, this advancement set the stage for evolution of seeds and pollen
Not really. The phrase you are referring to is this. ' Ontogeny recapitulates phylogeny. ' Or, as you say, development repeats evolution. A reference to organisms going through all the ancestral evolutionary changes in their development. Which they don't. For instance, human foetuses do not have...
It gives you an idea on how people in history were like such as how they dressed, what they did, ect.
There were more kinds of amino acids on the chondrites than are found in living organisms today.
Fitness in evolution means reproductive success . The fittest individuals are those which contribute the largest number of offspring to the next generation.
Yes and no. The Theory of Evolution and other scientific advances do disprove the biblical creation stories, but these were already disputed by Origen ( On First Principles , 3.1.1) in the earliest years of Christianity: . "Now what man of intelligence will believe that the first and the second and...
Yes and no. The Theory of Evolution and other scientific advances do disprove the biblical creation stories, but these were already disputed by Origen ( On First Principles , 3.1.1) in the earliest years of Christianity: . "Now what man of intelligence will believe that the first and the second and...
yes because kids can do home work on the computer and do research. you can also connect and look up old friends.
Helicobacter Pylori, the main cause of gastric cancer, has evolveddifferently in separate peoples, slightly modulating disease risk.This is usually used as part of a persons risk assessment forcancer, IE; African H. Pylori ancestry was relatively benign inhumans of African ancestry but was was found...
Let us use tallness in men and women as our example. In stabilizing selection a normal distribution of heights would be expected as the selective environment would not select against having all variants present in the population. In directional selection you would see men and women getting...
Through studying embryos, scientists have found that vertebrate animals seem to have a common design, even though their adult forms are different. Arm buds on different species, for example, look the same early on during embryonic development, yet they will develop into very different forms in the...