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Evolution
The scientific theory according to which populations change gradually through a process of natural selection.
5,264 Questions
Because lamarck thought that traits organisms aquired during their lifetime would be passed on to offspring. He believed that traits were determined by use or disuse. However, aquired traits cannot be passed on to offspring, only traits determined by DNA can.
Why is lamarck's theory not supported by the theory of natural selection?
Lamarck thought that traits organisms acquired during their lifetime would be passed on to offspring. He believed that traits were determined by use or disuse. However, acquired traits cannot be passed on to offspring; only traits determined by DNA can
Who were the eight men that fought against evolution and for biblical principles?
There have been a lot more than 8
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The proportion of the amino acids are similar to those produced in the Miller-Urey experiment.
Explain Lamarck's idea about how animals change through use and disuse?
If an animal uses something they will keep that trait if not, it will die out. For instance, the giraffe's long neck was required for survival therefore they kept the trait (their ancestor's had shorter necks, which Lamarck explained was because they inherited traits gained by their parents "who had to increasingly stretch their necks for food"--this theory was incorrect). In the first snakes, which were basically lizards because they had legs, they no longer need the legs so they lost them.
Speciation caused by change in the course of a river is an example pf divergent speciation?
Allopatric speciation.
The history of plants can be understood in terms of the evolution of what kind of structures?
Over time, the demands of life on land favored the evolution of plants more resistant to the drying rays of the sun, more capable of conserving water, and more capable of reproducing without water.
The trait, 'to live longer ', would only be selected for in individuals if it was reproductively successful. Then the alleles for living longer would be more frequently represented in the population of these animals.
Theory of evolution Vs Law of Thermo Dynamics?
The theory of evolution does not vs the law of thermodynamics. They are quite compatible since the earth is an open system.
Fitness in evolution means reproductive success. The fittest individuals are those which contribute the largest number of offspring to the next generation.
1) Offspring vary slightly from their parents
2) More offspring are born then resources available
3) This competition selects for the more fit to survive and reproduce due to the traits they inherited.
4) The more fit breed and give rise to offspring that inherit some of the parental traits.
This cycle is the process of evolution, in my own words
What theory proposes that species evolve during short periods of rapid change?
punctuated equilibrium
How might evolution theory account for this phenomenon?
Evolutionary theory can account for the phenomenon of a new species. This is because different species can evolve from a common ancestor.
Why did birds evolve after reptiles?
Because they can generate their own body heat - reptiles cannot and need a warm environment
Why did Darwin disagree with lamarck?
}Firstly, Lamarck reckoned that variation depended upon environmental factors of which frequently invert and alter throughout life's course for all sorts of organisms: the analogy of giraffes neck lengths determined and supported his argument in both further, quantity and greater profitable detail, on Lamark's behalf, because when they were alive, then passed this irregular measured feature of the neck which evolved and developed over thousands of years hereditarily through generations.
As opposed to this initial objective- the Darwinian theory determined that evolution occurred through natural selection and specie categorisation. Essentially, this exemplifies the survival of the fittest, where those more adapted and aptly suited to their naturally habilitated environment survive and procreate these environmentally developed gene copies to their offspring, valuably...
Furthermore, a mutation or variation in a species may possibly allow these two opposing theoretical arguments to familiarise briefly in some points and objectives made about each theory.For instance, "if there was a pig and a giraffe in a pen with only one tree, the giraffe would survive, whereas the pig would have no means of getting food so would die".
How horses have changed over time?
Horses have come a long way from the three-toed, dog sized prehistoric animal they once were. Todays horses are taller and by most accounts better looking, with many different breeds to choose from.
Why Darwin could not answer all the questions regarding to his new theory?
He didn't, that's why only accepting evolution as the only option of how the heck we are here is irrational
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Darwin was a scientist and as such understood that theories evolve as more information comes to light. He knew he didn't have all the evidence and as more came to light his theories would change accordingly. He was building on the work of others who came before him and knew later scientists would contribute their unique insights.
People think that the theory of evolution is a closed book with nothing else to contribute. And because the theory doesn't explain every single aspect of evolution, and that there are gaps in our current knowledge, that it is completely wrong. Science is alive, it changes and updates with new knowledge.
How does fossil evidence support the theory of evolution?
They tell you what lived in the past and when,
The similarity of sheep and reindeer is due to parallel evolution. This is when two species have a common ancestor and have developed similar traits, despite living in different areas.
What is a factor is not a strong piece of evidence for evolution?
C)
Many traits of modern birds resemble the fossils of winged dinosaursC)
Many traits of modern birds resemble the fossils of winged dinosaursAnswer 1
Evolution is not a process that can be reversed. The core principle behind evolution is that traits with a positive impact on survivability or reproduction tend to passed on to subsequent generations. Evolution itself is merely the slight alteration of a species gene pool over many generations. Perhaps you can see that the question "Is evolution reversible is something of a misnomer. Is the process by which you change something reversible In certain processes the thing that is changed can be returned to its original state, but this process also requires change. If you intended to reverse an evolutionary process the only way you could do so would be through evolution. This type of process has no non-reflexive logical inverse.
Perhaps what the question intended to ask was whether a species could "revert" back to a "less evolved" state. An example to explain this would be the reversion of humans to a more apelike genetic structure. This is certainly possible. If traits that were more apelike positively impacted the survival rate or the reproduction rate of the humans that had them than humans would begin to evolve to become more and more like our simian ancestors.
Answer 2 : There are certain examples of reversal in evolution .Most familiar trend can be seen in evolution of Dinosaurs which were of small size in Triassic period , evolved to maximum size in Jurassic period ,and again decreased in size in Cretaceous period .
Answer 3: The process of Evolution doesn't have a "direction", it doesn't favor one type of organism or trait as being "higher" than another. So in a broad sense evolution simply goes where environmental conditions dictate, there's no backward (reverse) or forward.
Could traits that were once non-adaptive reappear in a population if environmental conditions changed to make them adaptive again? Yes
Can an individual organism reacquire older traits that were not part of it's original genetic makeup? No
Do some older traits occasionally reappear in vestigial form in some individual organisms. Yes (there are instances of humans being born with a short tail etc.)
Answer 4
Evolution is basically a stochastic phenomenon. In order for evolution to "back-track", every single change in the genome that had occurred would have to be reversed in the exact reversal of the order that they occurred in. This is so extremely unlikely to ever occur that, were it observed, we would have to conclude aliens were pulling our legs.
But although evolution is not reversible, it is possible for traits to evolve a similarity with an earlier form. Consider for instance the fish-like shapes of whales: they evolved from land-dwelling mammals, which in turn can trace their ancestry back to early fish. Same shape, completely different genetics.
Answer 5
If you cloned an extinct animal, it might count as evolution going backwards. Not sure about that though, cause it's a pretty philosophical question.
What is non random association of alleles at two or more loci?
Allele association.
Linkage disequilibrium- measure of correlation in allele frequencies between two loci.
Non-random association indicated linkage disequilibrium while random does not.
