Questions tagged [evolution]

Changes in the heritable attributes of populations of organisms over time. The mechanisms of evolution are mutation, migration, drift, and selection.

Filter by
Sorted by
Tagged with
2
votes
0answers
445 views

How does the introduction of clones would affect population genetics? [closed]

Since the ability to clone animals gives another way to preserve species, this could help for the breeding process. It has been noted that with the ability to clone animals, endangered species can ...
2
votes
0answers
1k views

Why can we control our breath rate but not our heart rate? [closed]

Even though we cannot survive for more than few minutes if we stop breathing or if our heart stops, why is it so that our heart beat is controlled involuntarily while breathing can be voluntarily ...
1
vote
2answers
185 views

Junk DNA and “random” mutations [closed]

I'm somewhat irritated by "mutation" generally being described as a fully random factor in evolution: pure randomness does not seem like something that can survive in a long evolutionary process. And ...
1
vote
1answer
265 views

Hardy-Weinberg equilibrium generalized to add inbreeding (non-random mating)

Background Quoting from Gillespie's book The level of inbreeding is measured by the inbreeding coefficient, $F_I$, which is the probability that two alleles in an individual are identity by ...
1
vote
2answers
171 views

Does evolution only give rise to traits that confer fitness?

Does evolution only give rise to traits that confer fitness? In other words, does the existence of a trait imply it's conferring of fitness? If not, what are some counter examples?
1
vote
4answers
245 views

Why aren't all infections immune-system resistant?

It's been less than a century since the widespread use of antibotics started, and already we're seeing bacteria that have evolved immunities to the antibotics we use. On the other hand, we've been ...
1
vote
1answer
8k views

Evolution- Variations, adaptations and selective advantages

I am trying to understand Variations, adaptations and selective advantages and how they are all related. Feel free to add or correct me if I'm wrong- Variations are structural, functional, or ...
1
vote
1answer
183 views

Reproductive isolation causing evolution

My course book says about reproductive isolation that it does not allow the interbreeding among the individuals of different species. It also says that it is a cause of evolution. How is this cause ...
1
vote
1answer
1k views

What's the difference between evolution fitness and reproductive success?

What's the difference biological fitness and reproductive success in the biological terminology?
1
vote
1answer
69 views

What factors make a sequence evolve non-randomly?

On the wikipedia page about Fay and Wu's H, it talks about a non-randomly evolving sequence may be due to some selection acting or a selective sweep or population expanding/contracting. My questions ...
1
vote
0answers
64 views

Why are there no WINGED flying arachnids? [duplicate]

There seem to have been no arachnids flying WITH WINGS of any sort at any location or any time in the present or in the fossil record. Why is this? Rationale for question : If the process of ...
1
vote
4answers
2k views

Why can fish survive out of water?

Obviously, humans can survive underwater for a short while. I've assumed this is because at some point it benefited us to stop breathing momentarily, and so we evolved a respiratory system that was ...
1
vote
0answers
863 views

Were we able to create vitamin B12 in past?

All herbivores produce vitamin B12 de novo. Gorillas, for example, are "vegans" so I suppose some human ancestor was also herbivore. Have we ever been B12 self-producers? If so, why have we lost that ...
1
vote
4answers
135 views

Is variation a result of Evolution?

We know that the DNA copying mechanism that replicates DNA during cellular division is not 100% accurate and the resultant errors are the source of variation in the members of a population. At the ...
1
vote
2answers
583 views

How is the first Triceratops born?

To clarify at first, I have very little knowledge in biology and paleontology so there might be very obvious things I overlook. According to the evolution theory, there must be a graduate evolution ...
0
votes
2answers
147 views

Is there a taxon that “adaptively” radiates faster?

It seems that there are some taxa that have a greater potential to radiate through adaptations. Off my head, I can think of birds: Darwin's finches Hawaiian honeycreepers House finches (Carpodacus ...
0
votes
1answer
567 views

Have there been any macro-evolution experiements?

I'd like to start first by saying that I don't believe in creationism at all, nor any non-Darwinian-evolution explanation of the diversity of life on Earth. The theory, the fossil record, and the ...
0
votes
1answer
105 views

If evolution is true, how do all organisms have varying amount of chromosomes? [duplicate]

I thought genetic mutation changes genes and therefore evolution happens, but it doesn't explain how chromosomes are created/removed if the first organism had a set amount and now all the organisms ...
0
votes
1answer
62 views

Location of microbes causing eliminated diseases

Do eliminated diseases like polio, smallpox etc still exist in locations they have been eliminated from or in the wild or did we just make them go extinct like the dodo?
0
votes
1answer
652 views

Have scientists ever produce a new species in laboratory by means of natural selection?

I was wondering, if scientists ever produce a more complex species from a less complex species by means of natural selection? I imagine something like, bacteria which can't photosynthesis and oxygen (...
0
votes
1answer
121 views

Simplest Biological Organism? [duplicate]

What is the simplest biological organism from which a DNA sample has been or could be obtained? Could the resulting DNA be processed and examined in such a way that the resulting information would ...
0
votes
0answers
88 views

How did the tendency to perform death rituals evolve?

Both elephants and humans perform rituals when deaths occur. However, I do not see any evolutionary benefit of this. The rituals take time, which apparently could be better spent hunting, foraging, ...
0
votes
2answers
184 views

Are humans evolving since their first appearance? [duplicate]

Is the evolution a very prolonged progress, or are we going to witness further evolution of the human species? If so, in which direction? Are there any widely predicted changes for humans?
0
votes
2answers
58 views

Does a critical mass of infected individuals exist after which mutations will overtake vaccination attempts?

As we know, all organisms have a probability to undergo mutations when they replicate. For every infected individual with the Covid-19 their bodies are environments in which the SARS-CoV-2 may mutate ...
0
votes
2answers
276 views

Why can't we propose a solid theory regarding origin of life? [closed]

What information is greatly lacking which does not allow us to propose a solid theory for origin of life ?
0
votes
1answer
140 views

What is the point at which abiogenesis is complete and evolution begins? [closed]

Is the minimum criterion for life a single cell? It seems that self-replicating RNA is not enough, but I don't know. What would be the most basic cell that could fit this criterion and what cells ...
-1
votes
1answer
49 views

Probability for a megafauna specimen to exhibit a gene not present in either parent

What is the rough probability for a megafauna specimen to exhibit a gene not present in either parent? I'm looking, ideally, at the chance for one specific individual to be the first in a breeding ...
-1
votes
1answer
59 views

Estimate for number of genes changed in speciation between a megafauna parent and child species [closed]

At least in terms of a back-of-the-envelope calculation, what is a believable range for the number of gene changes between parent and child species to represent speciation between species of megafauna?...
-3
votes
2answers
864 views

If not intelligent design, what is an alternative scientific theory to evolution? [closed]

In the popular culture, Intelligent Design is often portrayed as trying to be an alternate theory to evolution. However, as the following question points out, it is not scientific, and so cannot be ...
-4
votes
0answers
24 views

Why do humans have one heart the size it is instead of millions of tiny hearts? [closed]

It seems that if we had millions of tiny hearts dispersed throughout the body, it would work better and easier. It seems that theoretically in the right environment, it would be an evolutionary ...

1
5 6 7 8
9