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Questions tagged [selection]

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Interpretation of narrow-sense heritability over one (using R/S = h^2)

Here is my data: Mean height score of the total parental population: 5.2 Mean height score of selected parents (those chosen for breeding due to their higher height): 6.4 Mean height score of the ...
BigMistake's user avatar
-1 votes
2 answers
94 views

Has artificial selection / selective breeding ever been targeted at intelligence?

Has it ever been attempted to breed a species, for example dogs, to maximize some aspect of intelligence? I find it particularly interesting to imagine one could selectively breed dogs to be able to ...
Julius Hamilton's user avatar
2 votes
2 answers
190 views

Is there any running experiment to selectively breed non-human smart animals?

Is there any running experiment to selectively breed non-human smart animals? I saw some scientists made overly tame and friendly foxes using fust selective breeding. Could it be possible to add the ...
Self Smarted's user avatar
4 votes
2 answers
47 views

Why is linkage disequilibrium high on either side of a beneficial mutation, but not between sites across the mutation, during a selective sweep?

I was reading the paper "A survey of methods and tools to detect recent and strong positive selection" (2017) and came across this: Upon fixation of the beneficial mutation, elevated levels ...
arara's user avatar
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2 votes
0 answers
152 views

How much Kanamycin is too much for selection in dh5α E. coli?

I'm using Kanamycin for selection after electroporation of my plasmid containing a kanamycin-resistance gene at a concentration of 50mg/L prepared in 1000x stock that is usually kept in frozen ...
doremi's user avatar
  • 327
1 vote
1 answer
44 views

What is the mathematical relationship between selection coefficient and dN/dS

dN/dS is often used as a measure of the intensity of selective pressure on a mutation or gene, but I'm curious about how it can be written as a function of the selection coefficient. I'm specifically ...
mrz123456's user avatar
7 votes
1 answer
850 views

Novel bacterial strains of bacteria first isolated on the International Space Station, did the space environment lead to these genetic changes?

Question Methylobacterium ajmalii sp. nov., Isolated From the International Space Station (Bijlani et al. Frontiers in Microbiology, 12, p. 534, 2021) is a thorough analysis of "novel strains&...
uhoh's user avatar
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0 votes
1 answer
105 views

Can a trait be too successful? Wouldn't overwhelmingly successful traits limit variability, which is one of the requirements of NS? [closed]

Can a trait be too successful? Wouldn't an overwhelmingly successful trait soon limit the gene pool, and if so, how would the process of natural selection react to that? If an individual is born ...
BentonB's user avatar
2 votes
0 answers
44 views

Evolution at a glacial pace: how does it work? [duplicate]

Some trees are very long-lived, such as the Great Basin Bristlecone Pine and the Giant Sequoia (up to 4,800 years old). How does natural selection and evolution affect such long-lived organisms? ...
cowlinator's user avatar
0 votes
0 answers
22 views

Selective breeding of organisms to survive on Mars [duplicate]

It seems that there may have been life on Mars, and it's also tempting to terraform and colonize the planet. This question is about testing the hypothesis "Can primitive life survive on Mars?&...
MrMartin's user avatar
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4 votes
1 answer
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The fraction of the genome that is evolutionarily conserved through purifying selection is less than 10%?

I would appreciate help in understanding the meaning, logic, and, in particular, how to interpret the phrase: The fraction of the genome that is evolutionarily conserved through purifying selection ...
user avatar
4 votes
1 answer
117 views

Selection marker for a cytoplasmic vector that works at low expression levels?

I need to express a selection marker on a plasmid in human cells (e.g. HEK293). However, I am using a cytoplasmic vector derived from a non-human virus with its own mechanism for transcriptional ...
Mowgli's user avatar
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-1 votes
1 answer
87 views

When is it reasonable to assume selection for an observed change?

In speciation events, a lot of changes seems to appear simultaneously. How can a specific partial changes, occuring together with a lot of other changes, be said to be advantageous or disadvantageous? ...
David Jonsson's user avatar
0 votes
1 answer
29 views

Does reversion of resistant strains to wild-type only occur when no more drug pressure is exerted

We always read that wild-type reversion of a resistant strain occurs when no more drug pressure is exerted. Could resistance reversion also occur under drug pressure, but from a drug other than the ...
Anthony Hauser's user avatar
0 votes
0 answers
28 views

Selection coefficient of gorillas

I've been reading about selective sweeps. And I found a case study that talks about drosophila and how their selection coefficient is between 0.0001 and 0.005. I want to know what it'll be like for ...
Ashwind's user avatar
0 votes
1 answer
338 views

What is it called when there is natural truncation selection?

Truncation selection is when a breeder selects for animals that exhibit a value for a trait that is above a certain threshold. What is it called when nature selects for a value of a trait that is ...
sterid's user avatar
  • 466
0 votes
1 answer
133 views

Selective breeding and Mutagenesis

I am writing an argumentative essay in which I claim that GMOs are safe. I know, it is not proved, but for the sake of my course I want to prove it. The counterargument that my professor said to me is ...
Tatiana Shevchenko's user avatar
3 votes
1 answer
446 views

Evolutionary advantage of consciousness [closed]

What possible theories are out there, regarding the evolutionary benefits of having consciousness? Why is not all information processing done subconsciously? Can it have something to do with language ...
Ravi Shankar's user avatar
1 vote
1 answer
2k views

What is the difference between disruptive, divergent and diversifying selection?

In our lab meeting we were chatting about divergent selection. I was confused at some point because I wasn't sure what was the meaning of this work in comparison to diversifying/disruptive and other ...
M. Beausoleil's user avatar
1 vote
1 answer
432 views

LacZ' selection: blue colonies despite ligation of insert

It has been suggested that bacteria transformed with pBlueScript vector, containing an insert in the middle of the lacZ' gene, can still give blue colour on X-gal, if the insert is small and ligated ...
GingerBadger's user avatar
1 vote
0 answers
39 views

What are the 2 general systems to understand the whole natural world? [closed]

In Graham Bell's book Selection, it's written: To some it may be a cause of regret that the natural world cannot be understood in terms of a single set of rules and laws, but at least, so far as ...
M. Beausoleil's user avatar
1 vote
1 answer
99 views

Does anyone know of a study supporting predictions #2 or #9 of the Extended Evolutionary Synthesis?

Regarding the 12 predictions made by the Extended Evolutionary Synthesis (http://extendedevolutionarysynthesis.com/about-ees/), does anyone know of a study that supports #2 or #9? It seems like #1, ...
sterid's user avatar
  • 466
4 votes
2 answers
124 views

What's the correct name for the war of sexes in evolution?

I'm searching for the correct term for the part of the selfish gene evolution regarding sexes. In nature, this means the evolution of the traits such as the ducks' adaptation to "trap" the drakes' ...
Probably's user avatar
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1 vote
1 answer
150 views

How do harsh conditions cause an increase in the male birth ratio?

I've heard that in harsh conditions more human baby boys are born than girls because a bigger ratio of them will die before reproductive age. But in which aspects of the random gene combination while ...
Probably's user avatar
  • 2,438
5 votes
1 answer
183 views

Could habitat selection pattern be deformed in environment with low variability?

It is possible that strong (clearly visible) pattern of selection towards particular parameter is detectable only in environment with high variability (difference between used (red) and non-used (grey)...
Ladislav Naďo's user avatar
1 vote
0 answers
24 views

Can paralogous genes be under negative selection?

I have just aligned 9 paralogous genes from human, uploaded them into MEGA and calculated negative selection. Can there be negative selection acting in between paralogous genes? Or how should I ...
Perlnika's user avatar
  • 111
7 votes
1 answer
1k views

Empirical evidence for species selection

Do we have any empirical evidence in favor of species (or lineage) selection? Do we know some cases that can only be explained (or seem to be only explained) by lineage selection? What are today the ...
Remi.b's user avatar
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6 votes
2 answers
1k views

How can sex ratios remain Fisherian (1:1) in species where only the dominant male gets to mate

In certain species only the dominant male gets to mate (or given strong preference), and yet the sex ratio remains 1:1. (I'm thinking in particular of gorillas). How does this happen? It doesn't seem ...
pseudosudo's user avatar
0 votes
2 answers
165 views

Sewall Wright for dunces

[This is one more post in my growing "X for dummies/idiots/morons/etc." series.] I've been enjoying Provine's The origins of theoretical population genetics for the last couple of days, but I must ...
kjo's user avatar
  • 179
2 votes
2 answers
1k views

Effect of zero selection (pressure) on the population health

Evolution naturally produces better features: stronger muscles, teeth and minds. Killing the weakest, evolution wipes defective genes out of populations. The mutations are necessary for advance. ...
Val's user avatar
  • 1
7 votes
1 answer
770 views

How selfish is Dictyostelium slug formation?

Dictyostelium is a slime mold which is well known for having a single cell free living phase and other some conditions (e.g. when food is scarce) for forming communal piles of cells called 'slugs' ...
shigeta's user avatar
  • 28.2k
2 votes
1 answer
226 views

Are genes associated with obesity selected for?

I've read that there are several SNPs associated with increased risk of clinical or morbid obesity. I was wondering if there is any evidence that these are under positive selection. Would you expect ...
niallhaslam's user avatar