New answers tagged evolution
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By "floor", I'm assuming you mean a smooth floor like that inside a house or building. I imagine that these beetles are actually quite good at flipping themselves over when they have something to grab onto -- e.g. a blade of grass, a fallen leaf, etc. The detritus-free environment that is the modern indoor floor (or smooth path, or paved road) is not part ...
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DNA misreplication events can lead to accidental duplication of DNA (even the entire genome), misalignements in recomibination events, integration of DNA from extracellular sources e.g. viruses. All these events can lead to large scale changes in the genome size of an organisms, smaller scale changes can be insertions and deletions in the DNA from repair ...
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In short, no evolution is not a result of variation. Evolution is a process in which each population in a system compete for a limited number of resources and each population has a fitness score (how well suited for the environment they are, this score is a man made concept to help illustrate the point), the populations with a higher fitness score tend to ...
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Is variation a result of Evolution?
No, you're putting the cart before the horse & mistaking cause for effect.
Variation is the result of mutation (whether caused by copying errors, radiation or whatever).
Evolution is the result of variation.
Mutation > Variation > Evolution
Evolution is merely the winnowing process by which more beneficial ...
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You're asking if cells arose with 100% replication accuracy and if lower accuracy was selected for under a feedback loop. Maybe there was a sweet spot for DNA replication accuracy in terms of efficiency, but it's highly unlikely that our ancestor cells had 100% fidelity in DNA replication because if we look at yeast for example, there are many genes ...
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There is previous research for that field of macroevolution.... Horse shoe crabs change slowly and tropical fish change fast.
You are right, it's not just random variation, it's fine tuned by DNA transcription processes which are too developed to be random, so the complexity of the processes leads scientists to think "WTF" regarding epigenetics, ...
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When a dog fights with a cat, the cat would be disoriented to scratch the dog’s two brown dots as the fake eyes. So the two dot fake eyes help protect injuries to the real eyes during a fight with cats. This is just my guessed hypothesis that needs to be proven by a scientist. : )
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Stallions/Geldings don't have nipples because a mares "udder" ,so to speak, is underneath her flank area. A stallion's/Gelding's penis is also as well underneath their flank. Their evolutionary genes keep male horses/donkeys/zebras from having these nipples.
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I've not read it but this SE question Why don't mammals have more than 4 limbs?
though not a duplicate (it asks about mammals not all vertebrates) may have some elements in its answers pertinent to your question.
And the question Why are there no vertebrates with more than four limbs? has been asked in Quora where it has 7 answers you may find useful.
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The Answer
It is correct that the product of the conceptual translation of a nucleotide sequence into an amino acid sequence results in the loss of certain information present in the former. An obvious example is that the amino acid sequences of the same protein in two individuals may be identical, but there may be silent mutations in the DNA, and these can ...
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Each has its own utility, depending on the time-frame you are looking at. For evolutionary studies, you need variation, but not so much variation that one substitution at the same position overwrites a previous substitution. So if you are looking at deep splits, over hundreds of millions of years, it may be that amino acids are more reliable. But you are ...
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Bilateria, as a clade (all animals, excluding sponges, cnidaria, comb-jellies, and placozoans) is monophyletic, and as such, originated from a single species that was bilaterally symmetrical. Sometimes the explanation for a particular trait involves ancestry, and if an innovation is advantageous, it tends to spread. Along with this group came advances in the ...
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