answersLogoWhite

0

🧪

Evolution

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

5,264 Questions

What did Darwin's theory of biological evolution explain?

Darwin's theory of biological evolution explained how species change over time through the process of natural selection, where individuals with advantageous traits are more likely to survive and reproduce. This theory helped to provide a scientific explanation for the diversity of life on Earth and the relationships between different species.

What are the four pieces of evidence that scientists point to as proof of natural selection?

The four pieces of evidence that scientists point to as proof of natural selection are the fossil record, biogeography, homologous structures, and observable natural selection in action. These pieces of evidence all support the idea that organisms have evolved over time through the process of natural selection.

What are the different units of the geological time scale?

im not sure about this but i think this is it.

Eonothem - Eon =4 total, half a billion years or more

Erathem- Era = 10 total, several hundred million years

System - Period

Series - Epoch =tens of millions of years

Stage- age =millions of years

Chronozone - Chron = subdivision of an age, not used by the ICS timescale

What can be considered evidence for evolution?

Virtually all species can be arranged into a nested hierarchy highly evocative of common ancestry. That was probably the pivotal piece of evidence launching the theory of evolution as the foundational science of biology.

There is also the fossil record which shows us that single celled organisms populated earth's oceans billions of years before the first multicellular organisms appeared. Multicellular organisms themselves dwelled solely in marine environments hundreds of millions of years before the first terrestrial forms gained ground. Fossils of plants and insects are common before any known terrestrial vertebrates. The first of these bear uncanny resemblance to sarcopterygian lungfish of the Devonian. The fossil evidence for evolution continues to mount from there--dinosaurs and birds dominating the mesozoic, mammals and flowering plants running rampant in the cenozoic.

In addition to the nested hierarchy and the fossil record there is substantial evidence from molecular biology in support of evolution. DNA sequences in eukaryotes accrue mutations at varying rates that help establish genetic clocks timing diversification events between species.

Embryological development is another key piece of evidence indicating common ancestry between species. There are numerous other substantial and significant pieces of evidence, but this small handful is a good start.

What evolution is called when unrelated organism live in similar environment?

Convergent evolution is when unrelated organisms develop similar traits or characteristics due to living in similar environments. This can result in analogous structures that serve the same function but have different evolutionary origins.

Was genetic basis for variations included in Darwins theory of evolution?

No. Darwin had no idea of what a gene was and did not even know that inheritance is particulate. He held with a " blending " idea called panspermia that was totally incorrect.

Mendel, by mathematical analysis, found that heritability was based on the particulate " factor. " Today we call these " factors " genes.

What problems did Darwin's theory of Evolution cause?

The problems are many, but let's just leave it at the basic science, and not get into a larger worldview set of issues. The only reason to have that discussion here would be because subscribing to Darwin's theory would keep you from denying the existence of a creator, and therefore your world view would be different, but that would then be suggesting other world views to counter this one.

As we clearly see from the example above, the problems are NOT scientific, but cultural. Social turmoil was created as Darwin's theory overturned the popularly accepted religious account of origins. This same sort of upheaval occurred three hundred years earlier when Galileo overturned the religiously based geocentric model of our solar system, in essence "dethroning" man from his exalted place in the heavenly scheme of things.

What is the emergence of a new species called?

The emergence of a new species is called speciation. This process occurs when a subgroup of a species becomes reproductively isolated from the rest of the population, leading to the evolution of distinct characteristics and eventually a new species.

When a population undergoes strong selection what happens to it?

When a population undergoes strong selection, individuals with advantageous traits are more likely to survive and reproduce, leading to an increase in the frequency of those traits within the population. This can result in rapid evolutionary changes as the population adapts to its environment.

What genetic processes allow a species to change over time?

Genetic processes like mutation, genetic recombination through sexual reproduction, and natural selection are key factors that drive changes in a species over time. Mutations introduce new genetic variations, recombination shuffles existing genetic material, and natural selection favors traits that provide a survival or reproductive advantage in a specific environment. These processes collectively contribute to the genetic diversity and adaptation of species over generations.

What does Miller and Urey's experiment tell us about the organic compounds needed for life?

This experiment tells us that a few amino acids could be created in a sterile environment of glass test tubes over a few weeks, demonstrating that it is possible for complex organic molecules to form spontaneously under abiotic conditions.

Were there any consequences in the theory of evolution?

Yes, there have been consequences in the theory of evolution, such as shaping our understanding of the diversity of life on Earth, explaining the relationships between different species, and influencing fields like ecology, genetics, and medicine. Additionally, it has led to significant debates and challenges to certain religious beliefs.

What type of selection can create 2 new species from one population?

There are several types of selections that can do this. It includes allopatric speciation where the population is separated by physical barrios, sympatric speciation where variations occur in the population, and allopolyploid when two species merge.

What sequences depicts a hypothesized evolutionary scenario?

  1. Fossil record showing transitional forms between two species.
  2. Genetic analysis indicating a common ancestor shared by two related species.
  3. Comparative anatomy revealing homologous structures across different species.
  4. Ancestral protein sequences showing gradual changes over time.

Which process of new species formation does this scenario describe?

The scenario most likely describes allopatric speciation, where a population is divided by a physical barrier, leading to reproductive isolation and the formation of new species due to genetic divergence over time.

Process of new species formation does this scenario describe?

This scenario describes allopatric speciation, where a population becomes geographically isolated and subsequently diverges genetically and reproductively from the original population, leading to the formation of a new species over time.

What was the first step in the origin of life?

It depends on what u believe in theres the bible and theres science.....

Scientist say that an asteroid hit the moon causing a big chunk to come off, all the space matter and that chunk started to form earth. on earth there was a bunch of volcanoes and it was very hot, water started to form in a hole then bacteria started to form, the bacteria went through Evolution creating modern day humans.....

What is evole?

It appears there is a typo in your question. If you meant to ask about "evolve," it refers to the process of gradual development or change over time, typically resulting in something becoming more advanced or complex. If you have a specific context in mind, please provide more details for a more accurate answer.

How does Sexual Dimorphism influence evolutionary change?

Sexual dimorphism can drive evolutionary change by creating competition between males for access to mates, leading to traits that enhance mating success. This competition can result in the evolution of exaggerated secondary sexual characteristics, such as elaborate courtship displays or physical features that attract mates. Additionally, sexually dimorphic traits may be favored by natural selection if they enhance reproductive success, contributing to the overall genetic diversity within a population.

What are the differences between Darwin's theory of evolution and conflicting theories?

It is no longer Darwin's theory, as Darwin has been dead about 130 years. There are no credible alternatives to the modern theory of evolution by natural selection. So, the differences is; the theory of evolution by natural selection is supported by myriad lines of converging evidence and explains the natural phenomenon that is evolution very well. The " conflicting theories " have no evidence supporting them and explain nothing.

How does survival of the fittest work?

Survival of the fittest, a concept in evolutionary biology, refers to the idea that individuals better adapted to their environment are more likely to survive and reproduce, passing on their advantageous traits to their offspring. Over time, this process leads to the evolution of populations with traits that enhance their survival and reproductive success in their specific environment. It is a key mechanism of natural selection proposed by Charles Darwin.

Can science explain creation and evolution?

There are two thoughts on the word creation 1. To make something from already existing materials 2. To bring into existence from nothing. As one cannot make something from nothing then the first idea must be the right one. The proper term for this is to organise and not create. The second part of your question regarding evolution is that all things evolved from some minute organism that suddenly came into existence, this is impossible. That evolution is still taking place must be considered in the light that all things are evolving. Man is taller,living longer. Girls are maturing at an earlier age. This is called The Law of Evolution. This is what we must think of when talking on this subject, the Law of Evolution

What is the true about gradulism with respect to punctuated equilibrum?

Gradualism suggests that evolution occurs slowly and steadily over time, while punctuated equilibrium proposes that species remain stable for long periods with sudden bursts of change. Punctuated equilibrium suggests that evolutionary change can happen rapidly in localized populations, leading to new species formation. Both theories offer explanations for the pace of evolution, with punctuated equilibrium emphasizing episodes of rapid change interspersed with periods of stasis.

How long does divergent evolution take to occur?

It has happened in as little as a single generation in the case of orchids. Generally speaking, groups of organisms that do not interbreed on on the borders of speciation, whereas those that cannot interbreed are considered to be separate species.

Dromedaries and llamas have been separated by more than ten million years, yet they can interbreed. Humans and chimpanzees are separated by less than six million years, yet it is doubtful our species can interbreed.

It probably depends significantly on the amount of change between groups, but I would estimate most species separated for more than a hundred thousand years would be sexually incompatible.

What did Hardy and Weinberg discover about the frequencies of alleles from one generation to the next?

That they change frequency from one generation to the next and can be easily calculated, with morphological traits visible and Mendelian expression seen, by this polynomial expansion.

p2 + 2pq + q2 = 1

-----------------------