Evolution

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The Theory of Evolution by Means of Natural Selection is accepted by most, almost all, scientists as an excellent account of how life must change and diversify and adapt across time. Evolution is considered factual and thus true by most scientists. The reason for this is the huge amount of evidence, which comes from comparative genetics, comparative genomics, comparative cytogenetics, biogeography, comparative morphology, comparative biochemistry, comparative behaviour and the fossil record.

A homologous pair is composed of two chromosomes that have similar genes in the same order. These chromosomes are one from the mother and one from the father and are similar in size and shape. Homologous pairs line up during meiosis for genetic recombination.

The currently held belief is that there is a good chance that life originated at the bottom of the ocean at mid-ocean ridges (where ocean crust is spreading apart) or at hydrothermal vents. Also, the photic zone in the ocean is a possibility for the birthplace of life that has not been discounted.

Divergent evolution is also known as adaptive radiation.

Variation was not the weakest concept in Darwin's theory. In fact, variation is a key component of natural selection, as it provides the raw material for evolution to work on. Individual variations within a population allow some organisms to survive and reproduce more successfully than others, leading to changes in the gene pool over time.

An allele present in all members of a population

Adaptive radiation is the process by which several new species evolve from a single ancestor in a short period of time. It occurs when a common ancestor adapts to different ecological niches, leading to the rapid diversification of species with distinct adaptations to their respective environments.

Vestigial organs are remnants of structures that were once functional in an organism's evolutionary past but are no longer needed. The presence of vestigial organs provides evidence for evolution by natural selection, as they demonstrate how organisms have changed over time in response to their environment. These structures support the idea that species have evolved from common ancestors and help to illustrate the concept of descent with modification.

There is no " what do I understand by the term evolution. " Evolution is the change in allele frequency over time in a population of organisms. This is a observed and observable fact.

It is no longer Darwin's theory of evolution by natural selection, but has had over 150 years of modification and improvement to become the modern synthesis.

A short definition of natural selection.

" The non-random survival of randomly replicating organisms. "

Strictly speaking, reproductive fitness is meant. The organism that has the most and best quality progeny adapted to the immediate environment will leave more representations of it's alleles in the population gene pool and the allel frequency will change over time fulfilling the definition of evolution.

One big Hardy-Weinberg assumption is that there is no mutation taking place in the population of interest. Mutation and selection lead to evolution, which the Hardy-Weinberg assumption also does not allow in a population. So, if there is the variation brought about by mutation then there is a chance of natural selection happening and this violates Hardy-Weinberg assumptions.

Natural selection over long periods of time leads to the gradual evolution of species, as individuals with advantageous traits are more likely to survive and reproduce, passing on those beneficial traits to future generations. This can result in the emergence of new species or changes within existing species to better adapt to their environment.

1. DNA- test the similarity in DNA

2. Fossil Records

3. Embryology- study of embryos during development shows the traits ancestors of humans once had such as gills and post anal tails.

4. vestigal structures- structures no longer in use can show what ancestors of the organism needed

Darwin's theory of evolution is based on the concept of natural selection, where individuals that are better adapted to their environment are more likely to survive and reproduce. Over time, this process leads to the accumulation of beneficial traits within a population, resulting in the gradual change of species. Additionally, Darwin's theory highlights the importance of variation within a population, genetic inheritance, and the gradual divergence of species over long periods of time.

The legal battle over teaching evolution, such as the Scopes Monkey Trial in 1925, was a showdown between modern science and religious beliefs. These conflicts often revolved around the separation of church and state, with proponents of evolution arguing for the teaching of scientific principles in schools without religious interference. The outcomes of these legal battles have shaped the modern education system and continue to influence discussions around science literacy and religious freedom.

Bottleneck
That is a condition of the Hardy-Weinberg law and the population is said to be in Hardy-Weinberg equilibrium , but it is an idealization that never happens in nature.

Darwin used the phrase "descent with modification" in his book "On the Origin of Species" instead of the word "evolution." He used this phrase to describe the process by which species change over time through natural selection.

Mendel's conclusion on the segregation and independent assortment of traits laid the groundwork for Darwin's theory of natural selection by providing a mechanism for how variation is passed down from one generation to the next. This understanding of how traits are inherited allowed Darwin to propose that natural selection acts on this variation to drive the evolution of populations.

The theory of evolution by natural selection. Evolution is a fact explained by the theory. Short explanation.

Natural selection is the nonrandom survival and reproductive success of randomly varying individuals.

Evidence from paleontology, molecular cell biology, genetics, biochemistry, geology, evolutionary biology, evolutionary development (evo devo ), embryology and a host of other disciplines, such as anthropology.

These show that alleles frequencies change over tim in populations of organisms.

These show that all organisms on earth are related in morphology and function.

Developmentally organisms are related. Vestigial evidences of relatedness.

Biogeographically evidences

A change in the frequency of a particular gene in one direction in a population is called genetic drift. Genetic drift refers to the random fluctuation of allele frequencies in a population over time, leading to a change in the genetic composition of the population.

Selective breeding, also known as artificial selection, is a process carried out by humans to develop desirable traits in plants and animals. In nature, natural selection is the driving force for change over time, where organisms with advantageous traits have a better chance of survival and reproduction, leading to those traits becoming more common in a population. While similar in principle, natural selection occurs without human intervention, unlike selective breeding.

Finding out how exactly traits are passed on to offspring - with variation - filled in a gap in the understanding of evolution that Darwin pioneered. Darwin did not know or understand how it could come to be that traits propagated through the generations with only minor variations, without blending. He could only assume that there was some mechanism that facilitated this propagation. His fear was that further research into genetics would show that sexual reproduction blends traits. Had that been the case, then evolutionary theory would have been falsified. In stead, what we learned about genetics - starting with Mendel, and culminating in the findings of Watson and Crick - confirmed what we'd learned about evolution in great detail.

Genetic drift is the random change in allele frequencies in a population. It is caused by chance events and has more pronounced effects in small populations where genetic diversity is lower. Over time, genetic drift can lead to the loss of certain alleles or fixation of others in a population.