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Evolution
The scientific theory according to which populations change gradually through a process of natural selection.
5,264 Questions
How does the theory of evolution help to explain the diversity of life forms?
When a creature ends up in a strange place, over time they evolve to survive in that place; to make best use of the resources, the space and the environment they live in.
So it follows that if two finches of the same species get lost - one on an island and one in a swamp, that despite the fact that they started out as the same species, generations later they will lead different lifestyles and have adapted to suit that lifestyle.
Say theres a lot of nut bearing bushes on the island; the finch's bloodline who got lost on the island will have adapted to have broader, sharply pointed beaks, the perfect shape for cracking nuts open. The Swamp finch (For short) will have landed somewhere where flys were very common. It's decendants evolve dainty, longer beaks to catch the flys. This is now their natural foodsource.
So what started out as two finches from the same species becomes severaly species, each evolved to survive in their unique environment.
What are the evolutionary advantages to seed formation?
Seed formation allows plants to reproduce without the need for water, as seeds can be dispersed by wind, animals, or other means. Seeds also provide protection and nutrients for the embryo, increasing its chances of survival. Additionally, seeds can remain dormant in harsh conditions until environmental conditions are favorable for germination.
List of reasons why evolution is true?
- There is strong evolutionary evidence by people such as Darwin.
- There is evidence in our biological structures ie: bones and DNA in particular.
Although evolution (the theory) is debated there is very strong evidence (look at Darwins books and research)
Distinguish between fitness and adaptation?
Fitness is a measure of the average reproductive alacrity of a particular variant, lineage or population.
Adaptation is a genomic change that increases fitness for the variants or lineages carrying the change.
How was oparin's hypothesis tested experimentally?
Oparin's hypothesis on the origin of life was tested experimentally through Stanley Miller's famous experiment in 1953, where he simulated the conditions of early Earth and observed the formation of organic molecules like amino acids from inorganic chemicals. This experiment provided evidence that the basic building blocks of life could have formed spontaneously under the conditions believed to exist on early Earth, supporting Oparin's hypothesis.
Why do scientists believe evolution occurred?
Charles Darwin developed the Theory of Evolution by Natural Selection before most of the fossil evidence for the theory existed. He looked at the micro-evolution practised by pigeon breeders, the evidence on the Galapagos Islands and elsewhere, and realised that evolution was the only explanation that made sense. He saw that related species were to be found in close proximity, evidence of evolution 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.
The fossil record shows clear evidence of evolution over a period of more than a billion years. Certainly, at first, there were no transitional species among the many species that had been found, although scientists saw much that did confirm the Theory of Evolution. That has changed, because many transitional species have been found. A recently discovered 220-million year old fossil, Odontochelys semitestacea, is a new species of turtle that had a fully formed shell on its underside, but only a small partial shell on its back, extending from its backbone. As well as a partial shell, Odontochelys semitestaceaalso had ribs that had begun to widen, thus demonstrating that the fully developed shell of later turtles evolved from the ribs of earlier species. Tiktaalik roseae is the name of a newly discovered lobe-finned fossil fish from the late Devonian period, that is a transitional form to amphibians, with basic wrist bones and simple fingers, as well as the robust ribcage necessitated by existence out of water. Odontochelys semitestacea and Tiktaalik roseae are two more pieces in the jigsaw that shows conclusively how life on Earth evolved from earlier species.
Scientists can now use DNA evidence from modern species to support the fossil record, as further evidence of evolution.
Why do some traits skip a generation?
I like puppies :)
Traits 'skip' generations precisely because most traits are not accounted for by a single gene, but by their combination with other genes. There is no brown hair gene, or blue eye gene. These traits may be controlled by recessive genes, so they seem to skip a generation from grandparent to you.
For example, if a trait is produced by a recessive gene, one of your parents may be a carrier but not possess the trait (because she inherited a dominant gene that overrode the recessive one). However, when her genes were recombined to produce the ovum from which you grew, and when that combined with your father's DNA, the trait may resurface.
How does environment relate to evolution?
The environment plays a crucial role in driving evolutionary processes by exerting selective pressures on organisms. Organisms that are better adapted to their environment are more likely to survive and reproduce, passing on their advantageous traits to the next generation. Over time, this leads to changes in populations and the evolution of new species.
Miller and Urey observed the abiotic synthesis of?
Miller and Urey observed the abiotic synthesis of organic molecules, such as amino acids, by creating a laboratory simulation of early Earth's atmosphere and conditions. Their experiment demonstrated that simple organic compounds could be formed from inorganic precursors in a prebiotic environment.
Identify the four principles of natural selection and provide examples not used in the section?
The four principles of natural selection are variation, inheritance, selection, and time. An example not used in the section could be antibiotic resistance in bacteria. Bacteria that possess genetic variations allowing them to survive exposure to antibiotics will be more likely to reproduce and pass on those resistant traits to their offspring, leading to the evolution of a resistant bacterial population over time.
What is the process by which modern organisms have decended from ancient organisms called?
The process by which modern organisms have descended from ancient organisms is called evolution. This process involves changes in the genetic makeup of populations over successive generations, leading to the diversity of life forms we see today.
Can you describe condition that makes it possible for a species to undergo adaptive radiation?
When the dinosaurs went extinct the mammals that were living alongside the dinosaurs underwent massive adaptive radiation. Large extinction events can give rise to niche openings for species that go through the extinction event.
How can natural order be disrupted by agriculture?
Look to the rain forest of Brazil. Agriculture and ranching are very much disturbing the natural order. This is not to make any value judgment on this one way or the other. Just the fact of disturbance is well observed.
What did Linnaeus do to help develop evolutionary theory?
Linnaeus developed the system of binomial nomenclature (the two-part Latin naming system) that is still used today to classify and identify organisms. Although he did not directly contribute to the theory of evolution, his work laid the foundation for the classification of organisms, which was later used by scientists like Charles Darwin to develop the theory of evolution.
No, evolution, the change in allele frequency over time in a population of organisms, is fact, The theory of evolution by natural selection, which explains much about evolution, is well supported by myriad lines of converging evidence, is internally consistent, explains the natural phenomenon it should and makes testable predictions. All science.
On the other hand, creationism and intelligent design are both pseudoscience.
Go here for the truth,
talkorigins.org
Microevolution can be described as?
Described by the definition for evolution. Evolution is the change in allele frequency over time in a population of organisms.
Many biologists, myself included, do not like the terms micro and macro evolution. The prefered terms many of us use are;
evolution ( instead of microevolution )
speciation ( instead of macroevolution )
What is struggle to survive in evolution?
The "struggle to survive", "survival of the fittest" and "natural selection" are all phrases to indicate the main guiding mechanism of evolution: differential reproductive success.
Darwin applied Malthus's idea of population growth outstripping resources to the theory of evolution by natural selection by suggesting that in nature, there is a struggle for existence due to limited resources. Organisms with advantageous traits that help them survive and reproduce in this competitive environment are more likely to pass on their genes to future generations, leading to the gradual adaptation and evolution of species over time.
Why is it necessary for organisms to evolve?
Organisms need to evolve in order to adapt to changes in their environment and improve their chances of survival and reproduction. Evolution allows organisms to develop beneficial traits that help them better compete with other species and overcome challenges in their surroundings. It is a natural process that enables species to gradually change over time in response to evolving conditions.
What was Darwins theory of evolution based on?
That trough time, a specie of animal, plant, bacteria can change.
When a life form reproduces, one of its"babies" may be different from its parents because of genetic mutation. Sometime, this mutation may give it an advantage over other individuals of its specie. (e.g.: A giraffe has a higher neck and can search food on high trees.) Because of this advantage, the life form that is different (we will call it A) can live longer and has better chances to reproduce. The life form that has not this advantage (we will call it B) will live less longer and will have less chances to reproduce. Because of that, the population of "A" will increase and the population of "B"will decrease. In the end, there will only be "A".
DNA sequences or genetic content. By comparing the genetic material of different species, scientists can determine how closely related they are to each other and their evolutionary history. This allows for the placement of distantly related species on the same phylogenetic tree based on genetic similarities rather than anatomical features.
This process is called evolution. It occurs through mechanisms such as natural selection, genetic drift, and gene flow, leading to changes in the genetic composition of a population over time. These changes can accumulate to the point where new species with distinct characteristics arise.
Is Darwin's evolution or biblical creation true?
Darwin's theory of evolution is the theory that modern lifeforms have a common ancestry, and that they evolved from their ancestral forms through the mechanisms of reproductive variation and differential reproductive success.
While all the scientific data so far supports evolutionary theory as an accurate model, at least in its fundamental theses, and while most all of the world's scientists accept evolutionary theory as fundamentally accurate, many people still object to it based on religious grounds.
In the end, everybody will make their own determination.
Most religions have holy books that have different viewpoints and these have accounts which are different from each other. Something to keep in mind.
All evidence would seem to support evolutionary theory, while there is no testable model - and therefore no evidence - for the accuracy of the notion of creation.
The most likely individuals in a population to survive and reproduce are?
The individuals in a population that are best adapted to their environment and possess advantageous traits that increase their chances of survival and reproduction are the most likely to thrive and pass on these traits to their offspring. This process is known as natural selection.
Type of isolation that led to the evolution of the kaibab squirrel?
The evolution of the Kaibab squirrel was likely influenced by geographical isolation, specifically caused by the formation of the Grand Canyon. This isolation led to a unique gene pool and adaptations in the Kaibab squirrel population, contributing to their distinct physical characteristics and behaviors.
