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Evolution

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

5,264 Questions

How do vestigial structures provide evidence for evolution?

Which model of evolution shows change over a relatively short period of time

How do fossil records provide evidence of evolution?

Fossils are like the clues the police use to solve a crime.

Each one tells a story. Like clues to a crime, where the police don't have to find a print of every footstep taken by a subject or confirm every thing that he did, the clues paint a logical outline of all the events around the crime.

Like clues in a crime the police do not initially identify a person they want to pin the crime on and then seek to tie him to the event - they find a number of clues which identify potential subjects of interest. They then attempt to prove the relation of these suspects to the crime until the trail of evidence is strong and dependable. Usually multiple facts on the same evidence are considered - for a crime it might be fingerprints and video tape and eye witnesses, for fossils it could be carbon 14 and dendronchronology and geologic strata.
It shows how organisms change over time.
Correct, yes. For example, the earliest vertebrates are jawless fishes, followed by fish with jaws. The earliest terrestrial vertebrates bear uncanny resemblance to sarcopterygian lungfish. The earliest fossils of reptiles bear remarkable resemblance to those earlier amphibians. The earliest birds share numerous reptilian features of therapsid dinosaurs.

This is just vertebrate evolution--we can trace similar stories of change in botanical fossil records, and the fossil record for various invertebrates.
Fossils indicate evolution occurred as they detail variations in bone structures of related animal species, and in plant forms and structures. Radioisotope dates of rock strata demonstrate how plants and animals changed over time. Fossils also reveal how the climate of an area in which the animal or plant lived in changed over of time and how the animal or plant adapted to its environment.

Fossils are remains or impressions of ancient creatures, some of which represent lineages now extinct, and others from which existing species evolved.
Well, do the skeletons of animals today look the same as those found as fossils? The differences between today's living organisms and those that lived thousands of years ago are the very idea of evolution: that life is constantly changing.
fossils are the cool thing about the evidence, as years go by a rock like build up happens and when this works into place you can see the years by the rock that is present around the fossils. when you see what rocks or how far you have dug the rocks will show you what the years it was in.

What are five conditions that can disrupt genetic equilibrium and cause evolution to occur?

Three ways genetic equilibrium can be disrupted include, mating not being random, mutations occur, and natural selection occurs. Two other disruptions are organisms move in and out of the populations and many populations are too small to begin with.

Which is the physically strongest human race?

There is no single "physically strongest" human race as physical strength can vary greatly within each race. Factors such as genetics, diet, and training play a significant role in determining an individual's strength rather than their race.

What did Miller and Urey do?

Simulated what they thought might be early earth conditions with the proper precursor elements and ran a controlled experiment by simulating lighting over a water environment. Certain organic molecules were produced and different experiments since then, using other atmospheric conditions, have showing the ease of producing these organic molecules. Amino acids and nitrogenous bases mostly. Many other experiments have shown nucleic acid replication and metabolic activity. ( RNA )

When did organisms suffer the largest mass extinction known?

The most devastating mass extinction occurred in the Late Permian (~250 million years ago).

Did Charles Darwin win any awards from he's theory of evolution?

He won The Royal Medal (1853), The Wallaston Medal (1859), The Copley Medal (1864) - ALJ ;)

The royal medal is awarded to three people annually by the Royal Society. The Copley medal is also awarded by the royal society each year and is the oldest Royal Society medal still being awarded.

The Wollaston Medal is an award for geology and the highest award given by the Geological Society of London

Is evolution a lie?

Of course not. Evolution is not a lie but a well supported theory. Some people believe it's a lie because it conflicts with their religious beliefs. However, being unable to provide any valid alternatives or evidence their arguments are not compelling. Two points I'd like to make. Most religious people who try to disprove this widely accepted theory, which forms the basis of biology, don't understand it. Evolution simply states that species can change over time. We have examples of evolution within our own recorded history. Different breeds of dogs, medicinal and edible plants are all examples of evolution. Evolution is a change in genome frequencies over time. Another example: Consider a population of moths, some are black and most are white because they have different genetic material. During the industrial revolution the trees the moths live on were partially covered with soot. Therefore the black ones avoided predation as they were camouflaged when they sat on the trees whereas white ones where clearly visible therefore were eaten more often by birds. Black moths had a high fitness (reproductions over a life time) in this environment and therefore more black moths were able to transfer the black alleles. The next population is going to be mostly black due to the increase in black genes transferred. This is an example of evolution as black allele frequencies increase and white allele frequencies decrease. This has all been observed and recorded. Ultimately it was noted that the predominantly black moth population now in this new environment and with different environmental pressures developed into a population that couldn't breed with their old half white half black ancestors. This constitutes a species; a population that cannot interbreed. This is a witnessed and recorded example. It is a fact. You can also look to the many different colored goldfish you buy. Some of these diverged from the same goldfish ancestor. Therefore evolution is not a lie those that do not accept it do not understand it because they consider that it suggests that God did not create organisms which on the contrary, it does not oppose.

As for the genetic drift argument below, a gene typically contains a thousand base pairs. Frequently these will be missing or reversed--EVERY single individual contains such mutations. These errors usually have no effect--they are benign. Sometimes they are beneficial, although usually they are detrimental. When they cause harm, the individual with those defective genes tend to be less capable of breeding, and passing on the harmful mutation. Sometimes, however, even a defective gene may spread through a population. One excellent example is the gene responsible for producing the protein that synthesizes ascorbic acid (vitamin C). This gene broke in early old world (African) primates. New world (South American) primates, which diverged before the gene broke, have a functioning copy. Our gene, inherited from the old world monkeys, is broken in the same manner. Creationists might want to ask themselves why God would break a gene in humans the same way it was broken in monkeys, if not to serve as evidence for common ancestry. No other mammal (except a species of fruit bat and hamsters) have a broken GULO gene. And in fruit bats and hamsters the gene is not broken the way it is in old world primates (apes and humans).

"Man to dung beetle" is typical of creationist misunderstanding of evolution. This needs no further elaboration.

The creationist then resorts to mathematical chicanery to illustrate a point about DNA replication, suggesting it takes a second for each link in a strand to form. The polymerase chain reaction (PCR) lays this idea to rest. Although it takes 20 minutes to amplify any DNA primer or set of primers, the power of exponential growth results in millions and billions of copies over a period of a single day. The drawback is that all of these are subject to random mutation. The advantage is that environmental selection is minimized, so the copies are static. An altered environment is the engine that propels evolutionary change.

You can use the same creationist DNA argument on a rock. A rock contains billions of atoms, each of which occupies a particular location. The odds against any specific rock are infinestismal, yet rocks are commonplace. Granted, "non living" arragements are more common that arrangements of atoms capable of self reproduction. Still, every bacterium is unique, and there are uncountable numbers of those. The biosphere is rife with various arrangements of successful replicators. Randomness factors in to EACH replication, as any given chromosome in an organism is likely to contain at least one errant base pair. Gene duplications, insertions, and deletions introduce thousands of base pair changes all at once, whereas polyploidy introduces millions of them.

Absolutely evolution IS a lie. Evolutionists cloak their lies by discussing natural selection and mutation and passing them off as evolution. Natural selection and mutation happen every day-no one would deny that. However, true Darwinian evolution has NEVER happened and will NEVER happen. I challenge any and all evolutionists to show real scientific evidence of even one animal EVOLVING into another animal (cat to dog, lizard to bird, ape to man, man to dung beetle....you get the idea). C'mon....all I need is just one. Good luck. Additions to answer two: Here are some stats (ie real data) you should look into in order to make an informed decision: There are approximately 50,000 genes in the human body. A single gene is made up of hundreds of thousands of chemical bases arranged in a very specific order. If even one of these chemical bases was missing or was placed in a different spot in the order, humans would be anything from a puddle of goo to who knows what. Knowing this, consider the statistical probability of getting these chemical bases of these genes in exactly the order that they need to be to create us. Consider the following exercise: 1. Take 3 numbered blocks, put them in a box and shake them up. There are six possible combinations of these three numbers. The probability of pulling the blocks out in order is 1 chance in 6. 2. Next add two more numbered blocks to make a total of 5. Now there are 120 possible combinations. The probability of pulling the blocks in orderhas increased to 1 in 120. 3. Next we'll add 4 more numbered blocks to make 10 total. Now the probability has increased to 1 in 3.5 million. If someone were to pull one block every 15 seconds, the probability of pulling the blocks in order would happen once every 18 months. 4. Next lets double the quantity of numbered blocks to a total of 20. If you could pull all 20 blocks out in just one second and repeat this every second, the probability of pulling the blocks out in order would occur once every 77 billion years (keep in mind that evolutionists maintain that the age of the universe is only about 10 billion years). This little numbers game is nothing compared to the complexity of even the simplest bits of matter. For example, the chance of forming a two-thousand atom protein molecule as something like one in 10 to the three hundred and twenty-first power (that's 10 followed by 320 zeros). Again, just as a reminder, there are 50,000 genes in the human body made up of hundreds of thousands of chemical bases each that must be arranged exactly the way that they are to make you. In the grand perspective of things, if you consider all plant and animal life on the planet and the specific order required to make all of them, there is no possibility of random chance evolution. Thank God for statistics.

Why was Darwins theory rejected?

his theory was rejected due to the religious perspective on life....Althought it was widely accepted by the scientific community, Catholocism disagreed (e.g- Wilberforce Huxley debate), the didactism of religion is that God created the world and everyting in it... not some theory of natural selection.

How did the study of fossils help support the idea of evolution?

Darwin's observations supported Lyell's theory of ancient earth undergoing continual change because Darwin theorized that geology and animals evolve the same way. Sir Charles Lyell was a geologist and a British lawyer.

What is a favourable characteristic?

A favorable characteristic, or trait in evolutionary biology is some trait that allows the organism increased survivability and reproductive success. Even if it is only incremental success.

Why genetic diversity decrease in founder effect?

Founder's effect is a type of genetic drift, a chance event that can disrupt the gene pool of a population. In this case, the gene pool is limited due to the similarity of genes shared within the group. These similarities are the result of a limited number of "founders" or individuals who started the population. A good example of founder's effect is the Amish population. A few individuals started the group and limited immigration and reproduction, which would have allowed for new combinations of genes to be added to the gene pool. Because of this lack of variation, the members of the population share many traits, thus resulting in decreased diversity.

What is the type of natural selection that favors intermediate phenotypes?

When natural selection favors the intermediate version of a characteristic, it is referred to as stabilizing selection. It is the opposite of disruptive selection.

Why would a flower petal be colored red?

Evolution. Plants use insects and small animals to reproduce. A flower may have evolved red petals to advertise its nectar to pollinators - butterflies, bees, or hummingbirds. They would in turn pick up pollen and carry it to another similar flower. Another reason is that since red flowers are pretty, red roses for example, so selective breeding my have caused it. Mankind has been selectively breeding flowers for beauty since ancient times.

What is the binomial nomenclature of a grape?

Vitis vinifera is the botanical name of grapes.

Family: VITACEAE The Grape family

Type and Use: Deciduous vine with edible leaves and fruit. Fruit is eaten, made into wine, jellies, jams, and other food products.

What does over reproduction have to do with Darwin's evolution theory?

That many more organism are born than can be supported by the environmental resources and this leads to a struggle for existence which favors the organisms that vary beneficially in survivability and reproductive success.

Does mutation depend on evolution?

The mutation theory is basically stating that mutation is one of the major factors that cause evolution. The mutation has to be a beneficial mutation, meaning that it has to help the survival of the organism that got the mutation. The mutation causes knew genes and diversity which can spread quickly throughout a population and eventually change the frequency of alleles (causes mutation)

Remember the mutation has to be beneficial to the survival of the organism.

How do adaptive radiation and convergent evolution differ?

Divergent evolution creates the divergence of a single species by isolating the gene pools of each species thereby increasing the differences between the population and eventually species. Divergent evolution is the evolution of different species from a common ancestor (and hence common characteristics) to attain new, dissimilar characteristics.

Convergent evolution works on a different level. Unlike divergent evolution, convergent evolution does not create species with similar derived characteristics. Convergent evolution involves the adaptation of several different, unrelated organisms to the same environment in the same way. For example, flies and birds are not immediately related yet they both cope with getting around by flying with wings- similar structures that are not derived from one and other. Convergent evolution does not create new species, unlike divergent evolution.

Convergent evolution is the co-evolution of different species with different ancestors in such a way that they attain the same characteristics independently of each other.

What kind of question would you ask about the evolution?

if homo sapiens evolved from monkey-like beings, from where are those monkey-like beings?

actually, the contributor above me is a tiny bit incorrect in his inquiry. humans and apes evolved from the same species, now extinct. evidence shows that humans and apes originated around the same time from one type of animal. so really we both are deformities or sub-species that have evolved and adapted from a greater race of intelligent species. and as for where that greater race is from, it also was most likely a variation an animal from a later evolutionary period, most likely when mammals were formed. so a question you might ask - from what period were the ancestors of humans and apes formed??

Has evolution been proved to be right?

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.

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Evolution is also still a "theory" having yet to be proven.

Before anyone starts bragging about the E. coli experiment that supposedly (but didn't) prove evolution. The end result, after 50,000 generations of breeding, with the experiment only proved life will find a way. It will adapt. Not evolve. Case in point... He got E. coli to live in an inhospitable environment, well, so do the Sherpa and Eskimos of today.

After 50,000 generations of E. coli breeding and experimentation... it has not evolved into another species.

50,000 generations ago... Humans were known as Homo erectus.

25,000 generations ago... Neanderthals were walking around.

There are SEVERAL complete species of change between modern humans and the ancestors walking around 1,000,000 years ago. And after 50,000 generations... he still has "just" E. coli.

We are still missing some key piece of evidence for the validation of evolution.

Answer

Technically, you can refute wrong ideas (hypotheses/theories) but you can never prove anything absolutely. Evolution is spectacularly evidence-supported. Evolution has no refutation. We are 99.9999999999999999999999999999999999999% sure that evolution is true. Note how pedantic this. With all the evidence we might as well say that we are 100% sure that evolution is true and that evolution is a theory that is more than a theory (a fact). Evolution is correct and is accepted by all respectable scientists who accept it due to its evidence.

What is an active site and what is its relationship to an enzyme?

an active site in an enzyme is the area that breaks the bond in its substrate.

E.g. a maltose molecule's glycocide bond is broken by the active site in a maltase enzyme.

What evidence do these similar structures provide in support of evolution?

Comparative DNA samples from chimpanzees and humans show very well the concept of evolutionary common ancestry. Aside from that, the differences in DNA among organisms, especially at certain loci, show how long two, or more, organisms shared common ancestry.