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Questions tagged [selection]

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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 ...
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0answers
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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 ...
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What is the difference between disruptive selection and opposing directional selection?

I'm wondering if there is a difference conceptually between disruptive selection and 2 opposing directional selection. As you can read here, it seems that disruptive selection can be thought as ...
0
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1answer
195 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 ...
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1answer
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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 ...
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1answer
277 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 ...
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1answer
912 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 ...
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1answer
302 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 ...
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0answers
37 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 ...
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1answer
77 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, ...
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2answers
110 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' ...
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1answer
128 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 ...
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1answer
160 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)...
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0answers
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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 ...
7
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1answer
925 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 ...
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2answers
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 ...
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2answers
156 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 ...
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2answers
955 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. ...
7
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1answer
563 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' ...
2
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1answer
204 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 ...