Skip to main content

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
3 votes
0 answers
26 views

Cuckoo interbreeding between those with different host species

Whilst there are many (~150) species of cuckoo, it sounds like in the UK there's only 1 (Cuculus canorus). However, this 1 species specialises depending on their host species/environment; e.g. their ...
JohnLBevan's user avatar
-1 votes
0 answers
8 views

Why some receptors have such high activation ceilings? [duplicate]

Why does the brain have receptors that have such a high activation celling, that no endogenous neurotransmitter could even come close to fully activate? Which ultimately results in there being certain ...
Antony Theo's user avatar
0 votes
0 answers
15 views

What prevented invertebrates from discovering flight a second time? [duplicate]

Vertebrates evolved powered flight three times in history, being pterosaurs, birds, and finally, bats. Invertebrates were the first to evolve flight on the planet... but flying insects remained the ...
Darth Biomech's user avatar
0 votes
0 answers
17 views

Why might allele frequencies change over many generations at neutral loci?

Lets say that a research team is looking at natural insect populations (e.g. beetle), and they find that allele frequencies at a locus in the genome have changed over the past few generations even ...
BananaGrams's user avatar
-2 votes
0 answers
14 views

What are the theoretical reasons that evolution can produce mutually necessary structures? [duplicate]

Disclaimer: I believe in evolution. This is not a criticism of evolution. I am simply trying to understand something. Disclaimer 2: I'm not a biologist, so my terms will be wrong. An organism consists ...
user56834's user avatar
  • 188
-3 votes
1 answer
87 views

Do cells know or imagine how each part of the DNA influences body structure and function? How else would evolution happen in specific ways?

Consider how an octopus looks at a rock and it's entire body blends in to resemble the rock. Consider how insects evolved to resemble leaves or twigs. Even frogs, butterflies and other creatures ...
Nav's user avatar
  • 563
1 vote
1 answer
85 views

Why should all life on Earth have a common ancestor?

In principle, it should be possible for whatever happened to create life to have happened in multiple places. Out of the millions of years this could have happened, it seems odd that it didn't happen ...
R-Obsessive's user avatar
1 vote
1 answer
38 views

Why is Archosauria a subclass and not a class?

What is the logic behind Archosauria being a subclass when they have such major differences between Lizards, Snakes, and Turtles. The Amphibians appeared before the Diapsids, which then split into ...
Dakota Wharton's user avatar
-2 votes
0 answers
27 views

I want to do haplotype network analysis using PopArt but now I am getting PopArt alert of "Too many trait latitudes read." How do I fix it?

I am doing a haplotype network analysis using PopArt software. It works fine until I try to colour the locations of my data by editing the Nexus file. When I try to load/open the Nexus file, it shows &...
RotavirusGuy's user avatar
10 votes
1 answer
1k views

Why are venomous mammals and birds so rare in comparison to reptiles and fish? [closed]

Why are venomous mammals and birds so rare in comparison to reptiles and fish? Metabolic reasons? Morphology? Selection pressures? Why are not all reptiles venomous but many are? Why are platypuses ...
li tchi.'s user avatar
  • 129
0 votes
0 answers
48 views

Looking for the exact text and attribution of "Evolution does not wait around" quote

I am looking for a reference for a quote that roughly said: Evolution does not wait around. Either things happen quickly or not at all. I thought the quote was from Carl Woese but I have gone ...
Paul Brodersen's user avatar
0 votes
0 answers
24 views

How long does it take for a creature to adapt for a different diet?

For the sake of the question, let's say that a population of piscivorous birds are put in a Europe-sized box. Half of the box is sea, populated with their diet of fish and crabs and cephalopods, and ...
Craig Morrison's user avatar
1 vote
1 answer
79 views

What does it mean when observed genotype frequency is different from expected genotype frequency in Hardy-Weinberg equilibrium?

As I understand it, if a population is at Hardy-Weinberg equilibrium, then the genotype frequencies should be $$p^2 + 2pq + q^2 = 1,$$ given the allele frequencies of $p$ and $q$, which you can figure ...
geneticscodingnoob's user avatar
1 vote
0 answers
45 views

Is there a continuum between analogous and homologous traits?

How closely-related do two species need to be for a trait they share (say, bipedalism in mammals) to count as homologous (divergently-evolved) as opposed to analogous (convergently-evolved)? In other ...
z8080's user avatar
  • 113
2 votes
2 answers
165 views

What "most closely related to" means in phylogenetic trees?

Here is a sample phylogenetic tree from a textbook publisher: We often ask questions like "Which organism is most closely related to the pig, the hedgehog or the cow?" I don't like these ...
toothandsticks's user avatar
0 votes
3 answers
91 views

If you want to understand evolution from a genetics standpoint what are some must reads be it books or textbooks? [closed]

The question basically sums it up. I'm looking for books/textbooks that explain evolution from a genetic perspective.
Shannon T's user avatar
  • 139
1 vote
2 answers
53 views

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
0 votes
1 answer
41 views

Evolution of the human Y chromosome

This recent news article suggests the number of genes in human male Y chromosome has steadily been reducing in the Y chromosome for a long time and is in danger of dying out all together. What I want ...
KDP's user avatar
  • 124
0 votes
0 answers
29 views

Is there a program that demonstrates overall fitness will increase in a population overtime?

Of course this will not always be the case with environmental factors, but generally speaking. I'm searching for a program that shows evolution works from a statistical standpoint.
Shannon T's user avatar
  • 139
0 votes
1 answer
85 views

Question on evolution theory from Book:Origin of species

Why, if species have descended from other species by insensibly fine gradations, do we not everywhere see innumerable transitional forms? Why is not all nature in confusion instead of the species ...
user avatar
1 vote
1 answer
70 views

Is it possible to live without iodine? (sea plants, seaweed or fish?)

I’ve come across a few other people asking this question on different forums such as on Quora, and Reddit… With my current understanding, we evolved from sea creatures which is why we still need ...
Lecifer's user avatar
  • 119
0 votes
0 answers
44 views

Evolution of Anoles

For context, I am currently looking at this virtual lab of Lizard Evolution by HHMI biointeractive. Trunk anoles from an island called Iron Cay were placed in a few experimental islands filled with ...
Branzzzz's user avatar
0 votes
0 answers
23 views

Why and how do species diverge in the same region?

I want to begin by saying thatt I'm not a student of biology, so I apologize if this is an obvious question. My question is about species in general, but I'll be focusing on hominins since I'm more ...
Fernando Chu's user avatar
0 votes
1 answer
71 views

Who put Cephalopoda in Mollusca?

Cephalopods are considered mollusks due to homologies such as a shell, a muscular foot, and a mantle. But, they also have closed circulatory systems, two giant eyes, and eight prehensile legs. When ...
imrobert's user avatar
  • 442
-1 votes
1 answer
69 views

Reference request for the evolution of faces

We humans have faces, as well as many other animals, like cats, dogs, monkeys, etc. But there was a time on planet Earth before there were any faces in living things. I am currently very interested in ...
user107952's user avatar
-1 votes
2 answers
108 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
0 votes
0 answers
48 views

What is the mechanism by which an animal has behavioral instincts?

I understand (at a layman's level) how evolution and natural selection work in regards to anatomy. The offspring has a slight mutation that makes it a better survivor in some way -- faster, stronger, ...
John Gordon's user avatar
1 vote
1 answer
80 views

What causes the activation of "Late acting deleterious genes" in late age but not in young age, whose accumulation causes ageing according to Medawar?

Sir Peter Medawar proposed that aging is the byproduct of "late acting deleterious genes". Evolution is good at weeding out genetic mutations that are harmful at an young age, before the ...
Sanjay Biswas's user avatar
-1 votes
1 answer
100 views

At which point does the physical change in evolution occur? [closed]

So you go from homo erectus to human for example. At which point do the actual physical changes take place. Does it happen in the embryo, is it only a change in DNA at a very early stage in the new ...
Andy S's user avatar
  • 43
0 votes
2 answers
116 views

Hardy-Weinberg Equilibrium Test Result for Merged Genotypes

I was curious if two populations are in Hardy-Weinberg Equilibrium (HWE), and if they are merged, then what happens? To find out, I considered populations from the 1000 genome project data. For ...
statm's user avatar
  • 1
-2 votes
1 answer
127 views

If split peas are good for health, why didn't evolution favour humans liking split peas?

Split peas, being legumes, are a source of food unanimously considered as healthy. My question is why didn't evolution favour humans that liked the taste of split peas? And/or maybe that could eat ...
FluidMechanics Potential Flows's user avatar
0 votes
1 answer
106 views

How could an aquatic animal’s organ evolve so it could live outside water?

How could a fish’s organs evolve so that it could one day live outside of water. I mean did it one day fully evolve then stick its head out of the water. That would mean that all the evolution of that ...
Andy S's user avatar
  • 43
0 votes
0 answers
44 views

Was there a first biological cell on earth? or a similar cell originated simultaneously around the world?

It logically follows that if life began on earth and life is cellular, then either that life began singularly or began simultaneously around the world? What is the evidence or argument for either ...
8Mad0Manc8's user avatar
0 votes
0 answers
53 views

Are there any plants that retrieve energy from the wind?

Many trees grow in windy places, but appear to have adapted to this by developing characteristics that provide resistance to wind. Are there any plants that appear to have been selected for the ...
Anixx's user avatar
  • 3,016
0 votes
2 answers
84 views

Postulate that one sex will put more resources into reproduction than the other

What is the name of the idea that because one sex will put more resources into reproduction than the other, that sex will try to minimize the number of mates (choosing the best one) and the other sex ...
user1070280's user avatar
3 votes
3 answers
317 views

Why are dogs descendants of Wolves but humans are not descendants of chimpanzees?

From here The dog, Canis familiaris, is a direct descendent of the gray wolf, Canis lupus: But from here Human and chimp DNA is so similar because the two species are so closely related. Humans, ...
user avatar
0 votes
0 answers
50 views

Has the speed of animals changed over time?

I am not a biologist but always had the following questions: Evolution theory says that the fittest of the fittest pass their genes on. Perhaps an oversimplification, but this would mean that slower ...
stats_noob's user avatar
0 votes
1 answer
54 views

Why do damaged joints or ligaments experience inflammation? Why do physiotherapists try to stop inflammation as part of the healing process?

I have had the repeated experience of going to physiotherapists with injuries to ligaments or joints and they all expressly aim to reduce inflammation. I don’t understand this. Our mammalian (and ...
Grazlewacky's user avatar
0 votes
0 answers
42 views

Is there a specific book or textbook that lists all of the specific concepts of the theory of evolution in one place?

By specific concepts I mean those such as Zahavian signaling, the "sexy son" hypothesis, Mendel's peas, Lamarckism etc. Essentially I am looking for a book that helps visualize evolution in ...
Qwokker's user avatar
  • 101
0 votes
2 answers
93 views

Is there a way to measure the handicap principle?

The handicap principle is used as an explanation for some genetic traits, such as bright tails in male peacocks. However, it seems that this principle could be used to justify sexual selection of ...
rus9384's user avatar
  • 1,541
2 votes
0 answers
34 views

Is this scenario allopatric or sympatric speciation?

I stumbled over a speciation scenario but I am not able to say to which type it belongs. I guess for people more familiar with the theory it might be easy to tell. I was reading about the fin whale (...
G. Blaickner's user avatar
0 votes
1 answer
48 views

Inheritance of child behavior based on daily life experiences of the parent

Our brain is a large network of neurons connected with each other.Our daily experiences change how our neurons are connected.Some experiences create better connections between two neurons A and B and ...
Cerise's user avatar
  • 101
5 votes
1 answer
281 views

What reproductive advantage do superhydrophobic spores bring?

Clubmoss plants produce spores that are superhydrophobic, meaning they will not mix with water. When you drop water on top of a whole bunch of these spores, the water will form tiny water droplets on ...
Maurice's user avatar
  • 253
0 votes
0 answers
14 views

An interesting paper on hunter-gatherer social dynamics and cooperation

I've read a paper long ago on the cooperativeness in the hunter-gatherer primitive societies. Their conclusion is that for hunters, cooperation dominates competition; for gatherers, competition ...
dodo's user avatar
  • 221
1 vote
0 answers
88 views

Why have mammalian predators been so small compared to their prey compared to theropod dinosaur predators?

So this is different than the question of "why are megafaunal mammals smaller than dinosaurs", which I understand to be a combination of: live birth limiting size (even sauropods had ...
Krupip's user avatar
  • 381
1 vote
1 answer
105 views

Models of evolution by positive versus negative selection

I am making a program for simulating natural selection. Now, I have discovered an interesting difference between positive selection and negative selection. Positive selection occurs when the ...
A Fog's user avatar
  • 111
1 vote
0 answers
23 views

Trying to find information about intraspecific allelic expression divergence in recombinant individuals due to changes in the cis regulatory regions

I am trying to find any research articles or resources that focus on differences in expression levels at the allelic level due to changes in cis regulatory regions in recombinant individuals. For ...
Joss's user avatar
  • 11
0 votes
2 answers
75 views

What is the evolutionary origin of euphoria and dysphoria?

What kingdoms from the three domains haven't evolved something like the reward system in us? Couldn't we feel neutral all the time and undergo an involuntary push towards the right behavior instead, ...
LLLK7's user avatar
  • 1
1 vote
1 answer
190 views

is there an assumption of homology?

Recently, i watched evolution vs creationism especially in islam view of evolution. There is one particular guy called subboor ahmad (he is muslim apologist). he claimed that there is an assumption of ...
Piee 3.14's user avatar
0 votes
1 answer
60 views

At what point does the capability of sexual reproduction diverge in evolution?

I am asking this question as a layman in biology: What the title is supposed to mean is, as a species evolves, say humans and chimps from its common ancestor, at what point and why are humans or ...
Roger Crook's user avatar

1
2 3 4 5
45