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Questions tagged [speciation]

Questions pertaining to the processes by which new species arise.

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2 votes
2 answers
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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
1 vote
1 answer
44 views

The split in Boroeutheria into Euarchontoglires and Laurasiatheria. Was this due to the opening up of the Atlantic Ocean?

I'm asking this question as a cat owner. I've seen a figure like 94 MA for the most recent ancestor of both cats and humans (this from, I guess, molecular clock arguments), and it kind of lines up ...
Emanuel Landeholm'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
0 answers
39 views

Can hybrids from closely related species with similar chromosomes reproduce?

Let's say the plant Triticum monococcum which has 2 sets of 7 chromosomes when diploid and 1 set of 7 chromosomes when haploid has the genome AA. When interbred with a different species that has the ...
Woo Luke's user avatar
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
3 votes
0 answers
44 views

In the absence of natural enemies, does evolution eventually create natural enemies?

I wonder if there is experimental evidence on this (either from computer simulations or perhaps cases of isolated species like on the Galapagos Islands). Imagine the hypothetical situation of a group ...
Kevin Ford The Submariner's user avatar
18 votes
1 answer
3k views

When does a virus become a different species?

Related: When does one decide to refer to a virus as a new variant? I've been thinking about all the news related to "variants" of the SARS-CoV-2 virus, including the infamous "Delta ...
Robert Columbia's user avatar
0 votes
0 answers
77 views

At what point in evolution is a new species identified? [duplicate]

As we know, a change in allelic frequency leads to evolution, and as these changes accumulate a new species is created. My question has two parts - A classical definition of species which is now not ...
Samardeep singh's user avatar
2 votes
1 answer
341 views

Defining "species" (Are species an emergent property or an ensemble of quantitative differences?)

Interbreeding Defining species by the criteria of not being able to breed is problematic: The concept loses its meaning in phylogenetic prospective, since closely related species were able to breed ...
Roger V.'s user avatar
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0 votes
1 answer
85 views

Are genetic crosses between asexual organisms possible?

To my knowledge (Please correct me if I am wrong), genetic basis is the key in defining species. When we encounter an unknown species, we can sequence it's genome and compare the genome with other ...
Noob's user avatar
  • 257
2 votes
1 answer
189 views

What is the meaning of 'primary' and 'secondary' sympatric speciation in this paper?

Sympatric Speciation in the Genomic Era. Both terms are used throughout the paper. I'm not able to make sense of these terms in the contexts used. I've also heard the terms 'primary' and 'secondary' ...
blammo69's user avatar
  • 101
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0 answers
170 views

Why are some bird hybrids fertile?

So, we all know that hybrids are infertile, that's the definition of a species, but how come some parrot species can interbreed and still be fertile. For instance a military macaw and a blue and gold ...
Rowan Blackwell-Cronie's user avatar
1 vote
1 answer
89 views

How does new species come into existence?

The only reason for the creation of new species that I found from the internet is geographical isolation. Are there any more reasons?
Young Prem's user avatar
0 votes
1 answer
237 views

Is it tautological that all living humans descended from a single male and single female human ancestor?

Many popular science articles cite high sequence conservation of mitochondrial DNA and the Y chromosome among living people as evidence that all humans are descended from a single male and single ...
J--'s user avatar
  • 428
2 votes
1 answer
44 views

What problem does the Dobzhansky-Muller Model resolve?

This page describes the Dobzhansky-Muller model and I can follow the illustration of the split leading to incompatible hybrids. But at the start of the page the author states "[Dobzhansky and Muller] ...
adkane's user avatar
  • 123
0 votes
3 answers
213 views

How does evolution explain the apparation of different group like: mammals, insects etc

When I am learning about evolution I barely see any source that explains how insects, mammals, reptiles and fish came to be. Can someone show me a source where I can learn about this? Especially ...
vorpal professor's user avatar
-1 votes
1 answer
137 views

Is evolution theory falsifiable by whether mutations result in a loss or gain of genetic information? [closed]

If I understand the theory correctly, evolution revolves around the process of adaptation of a being to its environment which results in the increment of survival and reproduction chances for that ...
sergeidave's user avatar
0 votes
1 answer
124 views

speciation in a single population

Most examples of speciation describe a population splitting (via various mechanisms) into two or more populations that eventually become separate species from one another. However, what if the ...
charlie_sar's user avatar
0 votes
1 answer
73 views

Book on the history of Darwin's discoveries and development of his theory

This question is a book request. I am wondering if there are any books with these elements: Tells the history of Darwin's discoveries. Captures Darwin's changing views of the origins of species, ...
Eff's user avatar
  • 680
0 votes
1 answer
91 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, ...
user8654's user avatar
  • 159
0 votes
2 answers
121 views

Speed of evolution [closed]

I know that evolution can happen quite rapidly in single celled organisms. How about animals? Has there been any record of new speciations over the past 1000 years? In this video it is claimed that ...
asmani's user avatar
  • 95
1 vote
1 answer
126 views

New speciations among Darwin's finches

In this video it is claimed that Darwin's finches arrived at Galápagos Islands just a few hundred years ago. Have there been new speciations over the past 200 years?
asmani's user avatar
  • 95
2 votes
2 answers
101 views

Spider identification please

Can someone tell me which spider this is please? I've found a few of them in my home in North-London, are they poisonous?
C.T's user avatar
  • 31
-5 votes
1 answer
2k views

How has the theory of evolution changed over time?

I learned at school and in the documentaries like everybody that (to summarize) molluscs evolved into fishes then reptiles then mammals then humans. Does the theory still make the same claim ? or ...
WaterBearer's user avatar
3 votes
1 answer
2k views

Are all hybrids infertile?

I'm familiar with the concept of hybrid infertility, but my question is: Are ALL hybrids infertile, or is it just so extremely unlikely that the chances are basically nil that they can actually ...
Matt Osborne's user avatar
1 vote
0 answers
52 views

How did hydrophilic plants become established on an isolated island with an arid coastal zone?

I find unconvincing the existing explanation of how several hydrophilic endemic plants became established at St Helena. This is one of the most isolated islands in the world, has an arid semi-desert ...
user8654's user avatar
  • 159
3 votes
1 answer
128 views

Practical Question about Evolution, Population Genetics and Speciation

North American cicada male of the genus Magicicada sing depending on the species at different times of the day and attract the females of the corresponding species. The species are very similar, but ...
ScientiaEtVeritas's user avatar
0 votes
2 answers
5k views

How many generations does it take for one species to become a new one?

First lets consider that a species is a group of individuals that can reproduce by breeding fertile offsprings. It's usually said that evolution takes a very long time. Lets say that 1000 generations ...
WaterBearer's user avatar
0 votes
2 answers
183 views

How to produce correct epithet of a species named in the honor of a person?

I want to name a new diatom species in the honor of Prof. Vodyanitskiy. What will be the species epithet: "vodyanitskiya", or other? Are there any rules that regulates how the end of such epithets is ...
Ivan Z's user avatar
  • 155
3 votes
1 answer
174 views

Interbreedability between current humans and his ancestors

I want to know the first point of time in the past when genomes have diverged so far from modern human genomes so that they both (human and ancestors) are not interbreeadable anymore and can be seen ...
oopexpert's user avatar
  • 133
2 votes
0 answers
52 views

At what point in life's history was biodiversity at its greatest?

When considering plant & animal species throughout the entire Earth, at what point in life's history was biodiversity at its greatest? The aforementioned question stems from this article about ...
user avatar
1 vote
0 answers
45 views

How are baselines for extinction rates established?

At the time of 2010, the UN Environment Programme estimated that 150-200 species of plant, insect, bird and mammal become extinct every 24 hours, and, that this is nearly 1000 times greater than "...
user avatar
2 votes
2 answers
174 views

Is there any artificial species (in particular, an artificial species of animal)?

Dogs were artificially selected from wolves, but a dog and a wolf can produce fertile offspring, and thus are of the same species. I had heard that the aurochs and cattle were different species, but I ...
Seninha's user avatar
  • 123
2 votes
1 answer
156 views

How extensive was interbreeding among human species?

I have read this article about non-Africans interbreeding with Neanderthals, Neanderthals interbreeding with Denisovans, and Asians interbreeding with Denisovans as well. Now, I'm wondering what ...
Marc R's user avatar
  • 121
0 votes
1 answer
849 views

Is Race the Result of Microevolution

I've been studying evolution for some time and was wondering whether the emergence of different races is an example of micro evolution within our species? Bonus Question: is it impossible for homo ...
Aniekan Umoren's user avatar
1 vote
1 answer
35 views

Which is a good methodology to find out a domestication process?

I just started with my course in genomics and I'm working with domesticated animals (cows, chickens, pigs, etc) and I would like to know which methodology is better to trace the process of ...
Paul Damián Jiménez Nuño's user avatar
1 vote
1 answer
1k views

Are there any half-evolved animals alive today? [closed]

I know that there are animals that are "simpler" than other animals but are there any that are half-evolved? Are there any animals with half-evolved functions, like arms, legs, etc? This was part of ...
Bryce's user avatar
  • 43
1 vote
1 answer
191 views

How do similar environments on islands in close proximity result in allopatric speciation?

I would like to ask a question on the very classic example of allopatric speciation seen in the Galapagos finches. Adaptive radiation occurred because the finches flew from island to island, so there ...
WilliamKin's user avatar
6 votes
2 answers
223 views

Can Eskimos be regarded a distinct species from Kalahari Bushmen based on morphological differences & geographic isolation?

I was motivated to ask based on the answer to another SE Biology Question that uses the following argument to conclude that two varients of snake are indeed a different species: To test whether [...
curious_cat's user avatar
4 votes
1 answer
14k views

What is the difference between a species tree, a gene tree and a phylogenetic tree?

I have found websites and text books disagreeing over this. For example, Phylogenies are also known as “species trees”... http://biologos.org/blogs/dennis-venema-letters-to-the-duchess/evolution-...
Meep's user avatar
  • 2,949
8 votes
1 answer
2k views

Can some human groups evolve into new species?

The Sentinelese people are an indigenous people of the Andaman Islands, in the Bay of Bengal, an essentially hunter-gatherer society subsisting through hunting, fishing. There is no evidence of either ...
user avatar
4 votes
2 answers
558 views

What determines the sex of hybrid offspring?

I'm aware of the usual definition of Haldane's rule, which says that, if the offspring of inter-specific hybrid offspring are sterile, then the sterile offspring will be of the heterogametic sex. That ...
Katrina's user avatar
  • 41
4 votes
4 answers
417 views

How to introduce predators to a simulated ecosystem?

I made an evolution simulator and observed that when a marginally competent predator appears, it quickly multiplies and hunts down all of the prey animals, which leads to their own extinction soon ...
user289661's user avatar
2 votes
1 answer
9k views

How to read cladograms/phylograms?

I understand the difference between cladograms and phylograms; the latter can show the evolutionary linkage over time. However, I am having trouble finding out which two organisms are most closely ...
city7lights's user avatar
0 votes
1 answer
774 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 (...
hans-t's user avatar
  • 119
2 votes
3 answers
1k views

Is an egg classified based on the species inside it, or by the species that laid it?

Basically what I'm asking is if an animal of species x were to lay an egg, and the animal inside that egg happened to be the first member of a genetically new ...
123's user avatar
  • 470
93 votes
6 answers
38k views

How could humans have interbred with Neanderthals if we're a different species?

To be clear, I'm not doubting that Homo sapiens and Homo neanderthalensis did interbreed: of that much I'm convinced. Within the past few years I've seen an upcropping of pop-sci articles discussing ...
Dave Kennedy's user avatar
  • 1,033
1 vote
1 answer
67 views

Genetics of Hybrids

I'm working on this problem, but I'm not sure I've done it correctly. My initial thought was that the answer was $D$, but I don't see anything in the above graph that indicated the Hybrid species is,...
Anthony Peter's user avatar
5 votes
2 answers
1k views

Living intermediate species?

Hypothetical question regarding three animals 'species' {A, B, C}. Are there any examples in nature where {A and B} cannot regularly produce viable offspring, however {A and C} and {B and C} can ...
kd88's user avatar
  • 153
5 votes
2 answers
355 views

Does polyploidy always isolate the polyploids from the diploid source population?

I am receiving conflicting information while researching polyploid speciation. On the one hand, some sources state that a polyploid can only reproduce sexually with polyploids having the same number ...
CuriousAboutPolyploids's user avatar