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Questions tagged [evolution]

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

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Is transition more common than transversion during the evolution of duplicated genes?

Transitions are base mutations of purine to purine (A <-> G) or pyrimidine to pyrimidine (C <-> T). Transversions are purine to pyrimidine or vice versa (A <-> C, A <-> T, G <-> C, G &...
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Possible to breed human-adverse mosquitoes?

Some time ago I read a paper on fruit flies, in which the researchers bred a population of flies to avoid a particular fruit. They did this by exposing the flies to two different types of food (say, ...
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57 views

Learning tensors for evolutionary or developmental biology

I'm looking for book recommendations on tensor algebra for use in biology. Tensors are being used increasingly in evolutionary biology and developmental biology, it seems. For example, here is an ...
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520 views

What kind of owl does this moth look like?

I found this moth and I noticed that it looked like an owl to me and remembered something about how some moths camouflages look like predictors? What kind of moth this is and what owl does this moth ...
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61 views

Examples of points in evolution where two species stopped being interfertile? [closed]

Apologies in advance for not using the right terminology here; I'm not a biologist. This isn't for homework or anything; just curiosity. I'm wondering: at what point do two divergent species stop ...
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24 views

How did craniates evolve?

Looking at most chordate phylogenetic trees, it seems that we usually have something like this: ...
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100 views

Population genetics indicates that a billion years are needed for establishment of the millions of genetic differences between human and chimpanzee

Genetic differences between human and chimpanzee include ~50,000 amino acid changes, ~30,000,000 point mutations in non-coding sequences, and millions of insertions, deletions, inversions, genomic ...
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131 views

Pangenesis and Lamarck's theory of inheritance of acquired characteristics

I've read that Darwin had split ways with Lamarck's evolutionary ideas. Yet his theory of pangenesis seems to support Lamarck's theory of inheritance of acquired characteristics. What am I missing?
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90 views

Are we evolving as fast as the oxygen is depleting?

How much oxygen saturation have we lost in the last 100 years? As oxygen levels dwindle and industry, deforestation, and population increases, at what year and saturation will the low levels of ...
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1answer
82 views

If wolves (or foxes) are fitter than rabbits, why rabbits have not become extinct? [duplicate]

I do not pretend to "demolish" the Darwinian theory of biological evolution and the "survival of the fittest", that's far from my intention. I have this doubt because of the fact that humanity, as ...
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46 views

What is the adaptive significance of temperature dependent sex determination?

Why do some reptiles have TDSD ? Is it because one of the genders is healthier than the other that only they, can survive high temperatures?
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55 views

Why do we have a protruding nose?

What is the evolutionary reason behind a protruding nose ? And why don't monkeys and chimpanzees, for example, have it? Some say that the large brain in the skull kicks out the nose. But why do we ...
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46 views

Time taken for species to become endemic [closed]

Is it known how long species take to become endemic? I know from examples such as Canada which have no endemics following the end of glaciation that the process must take at least 10 thousand years, ...
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Can a polyploid be a “clone” of a single parent?

I still need to learn more about the different mechanisms for polyploidy, but from what I can tell, a polyploid can be an exact clone of the parent, except that its chromosome count has doubled. If ...
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1answer
74 views

About The Selfish Gene Book - How Replicators Molecules forms duplicates?

I was reading The Selfish Gene. In the 2nd chapter - "Replicators" I read: Think of the replicator as a mold or template. Imagine it as a large molecule consisting of a complex chain of various ...
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4answers
92 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 ...
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2answers
62 views

Visual and clear example of the idea that “animal doesn't need to understand the evolutionary function of its actions”

This is a question about education. I am trying to come up with a very visual and clear example, to explain a particular concept in evolution. The concept I am trying to explain is, the fact that ...
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1answer
53 views

Why and how does falsifying sensory information work? [closed]

Some context, before the question: Whenever I have a craving to binge on something sugary, I just prepare a cup of extremely bitter green tea (with 3 bags of tea) and I imagine myself binging on ...
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39 views

Neuroscience - A neuron with two types of synapses (electrical and chemical) at the same time

I learn that the nerves from the Peripheral Nervous System can carry signals from and to other organs of the body. I'm wondering if A Single Nerve carries 1) Only chemical signals 2) Only physical ...
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74 views

Paper saying that humans and animals are (mostly) the same age

I'm brazilian and today I've came across this news published in a religious brazilian site. It's about a recent study that says that 9 to 10 species on Earth today, including humans, came into being ...
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27 views

Did the chromosomal fusion within humans affect phenotypical change compared to the separated chromosomes in the other apes?

I just read this article on the evolutionary divergence between humans and chimps, and how the most significant event was when the 24 number of chromosomes in chimps was reduced to 23 in humans due to ...
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1answer
153 views

Dependency graph of life

This is a fascinating paper I read using Bayesian analysis to compare different graph models to genomic data. Intriguingly, it shows that a dependency graph is a much better fit than a tree model. ...
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68 views

Black oyster of sweet water

I have seen recently a documentary starting with introducing of the spectacular black oyster of sweet waters which imitate exactly like a prey fish in order to convey its eggs to predator fish's gills,...
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1answer
68 views

Are there limits to drug resistance?

It's well-known that indiscriminate use of a drug leads to resistance. My question is what the limits on resistance are. It seems obvious that there must be limits: for example I can hardly imagine a ...
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1answer
90 views

What to call a trait that has current utility but unclear evolutionary origin?

I'm looking for a commonly used term to describe a trait that has clear current utility but an evolutionary origin that is uncertain and that we do not necessarily wish to emphasize in our description ...
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58 views

Factors That Would Promote Eusocial Development In Mammals?

What would cause mammals to evolve to be more eusocial, like the naked mole rat did? What advantages does eusociality give in such scenarios?
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Hamilton's rule: When to change the equation?

So, in class, my teacher gave two examples of using hamilton's rule. Let b= 4 and c=2.5. The first was whether altruism would evolve between two diploid full siblings given these values. Since r=1/2, ...
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2answers
56 views

what are some examples of how evolution's limitations prevented species from climbing to the absolute highest peak on the fitness scale?

In this answer, the author argued that plants are green instead of red or any other color because of some limitations of the evolutionary process. what are other examples in which the physical and ...
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2answers
115 views

If life began at sea, why organisms are less salty than the sea?

We may take it for granted that a fish, a seaweed, or clams are not too salty to eat, although the sea around them is salty. I know about the existence of a mechanism which prevents their body from ...
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1answer
52 views

How would I represent this on a cladogram?

So, right now I am making a cladogram (More of a dendrogram) for a kingdom of fictional species, and I'm not exactly sure how to represent a certain relationship. Let's say that the oldest class in ...
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0answers
23 views

Are there any open phylogenetic projects that don't require coding to make a contribution

I am stay at home learner, not pursuing education formal education and currently doing a part time job. I've however completed masters in biotechnology and I'm studying to pursue PhD in molecular ...
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0answers
37 views

How to quantify the strength of social bonding between the individuals of a colony? How to compare the strength of social bonding across the species?

Consider two different species of honey bees. If I have to compare the strength of social bonding between the two species i.e. in which species, social bonding between the individuals is stronger than ...
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2answers
57 views

What (if any) is the shortest evolutionary process observed by humans? [duplicate]

So when I think of evolutionary processes, I think of it taking millions of years to happen. Like how humans evolved from monkeys or birds evolved from dinosaurs (I know that is super-duper simplified)...
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191 views

Are all mammals capable of sneezing?

I only know dogs and humans sneeze... so do other mammals sneeze as well? Is it possibly an evolutionarily-determined immunological trigger?
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4answers
234 views

What did the evolution of multicellular animals look like?

What did the evolution of multicellular animals look like? Aspects of this question include: (1) Are there any living organisms that might be helpful in visualizing "transitional forms" between ...
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1answer
54 views

Why do most theories assume “only” sexual reproduction can cause genetic diversity?

The reason cited for sexual reproduction trumping over asexual reproduction broadly relies on the advantages of genetic diversity. This completely overlooks the fact that a mutant which is able to ...
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6answers
321 views

Why are there not two trees of life?

Life on earth started an estimated 3.8 billion years ago, very soon (in geological time) after the earth’s surface cooled to become solid and the first oceans formed. Nowadays, we believe that all ...
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36 views

Why aren't “Water Giraffes” a thing?

If we assume that the Brachiosaurus and the modern Giraffe with their long necks both came to be by the need to reach higher-situated vegetable nutrition (which is a somewhat controversial assumption ...
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108 views

When is Semelparous reproduction most likely to be favoured?

Under which of the following conditions is Semelparous reproduction (where organisms produces all its offspring in a single reproductive event) is most likely to be favoured? (A) Adult survival rate ...
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2answers
57 views

Is it true that it is mostly impossible, for any kind of antibiotic, to succeed in killing off every bacteria in a very rich environment?

It is commonly believed that the resistance to antibiotics by micro-organisms is truly evolution at work, and that the recent surge in superbugs may very well be attributed to it. When we refer to a ...
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92 views

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 ...
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25 views

How taking up plasmids on heat shock evolutionary advantageous to bacteria?

During the transformation protocol we apply heat shock to bacteria to make them take up plasmids from their environment. It is really useful in the lab. However, it presents an evolutionary paradox ...
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5answers
371 views

How does evolution eliminate problems that only cause diseases late in life?

Humans are vulnerable to heart attacks and strokes. Our modern diet leads to atherosclerosis, this already starts at a young age but it doesn't cause symptoms until an important artery is almost ...
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38 views

Are seeds alive and by what mechanism do they 'Spring back to life'?

Correct me if I'm wrong but, human and plant cells require, at least to my understanding, a supply of energy, water and other neutrients to survive and carry out functions (such as sell division). ...
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2answers
49 views

MLE estimation with Mk model in ape or phangorn?

When doing MLE with the R package ape or phangorn, is it possible to set the substitution model to Mk? If so, how does one do this?
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1answer
130 views

Darwin's views on Lamarckian Heredity?

Currently I'm reading She Has Her Mother's Laugh: The Powers, Perversions, and Potential of Heredity, a fascinating book about heredity by the popular science author Carl Zimmer. While reading this I ...
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2answers
117 views

Does evolution select against genetic diversity?

Only the best genotype in a species will win. So it sounds like evolution selects against genetic diversity.
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29 views

How did half of humans pass on genes to the present day?

https://www.lesswrong.com/posts/cHEQSEPz4eipGHFy9/differential-reproduction-for-men-and-women Studies show half of humans who lived 10000 years ago passed on genes to the present day. This doesn't ...
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52 views

Can the environment affect genes and adaptation in offspring?

I recently read several articles that believe that environment can affect gene expression and this change will transfer down to the children. Some theorists believe that random mutations are more rare ...
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2answers
51 views

For long term survival of a species in a harsh environment which is more important-mutation or evolution?

The environment is the ultimate cause of population stabilization. Considering the environment to turn harsh for the survival of a species.How to adapt better to this change-by evolution or by ...