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Questions tagged [human-evolution]

The study of evolution with a particular focus on questions about the evolution of modern humans.

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Why don't women continue to produce ova indefinitely?

Why has the human body not evolved to produce more ova? Is there some technical reason that makes is easy while the fetus is developing, but much harder later in life? Or, perhaps more likely, is it ...
Iris's user avatar
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1 answer
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What sort of social structure might *Homo floresiensis* have had?

I've found limited info on how they may have lived. Physically, we've deduced the so-called "hobbits" used stone tools and hunted dwarf elephants in the Liang Bua cave, in hilly terrain 600 ...
Charlemagne's user avatar
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How did the fusion of Chromosome 2 spawn a separate smarter species?

I’m familiar with the evidence that two primate chromosomes fused into human Chromosome 2, and I understand that primates with such a mutation could still breed with those without it. My question is, ...
Jerry Guern's user avatar
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2 answers
157 views

Different hominid species or simply mutated humans?

I am not a biologist, however, I am curious as to how do evolutionary biologists classify a newly discovered hominid fossil as a separate species. If simply the bone structures are a criteria to ...
Dr. user44690's user avatar
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0 answers
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Are all humans related to one mother and one father? [duplicate]

Are all humans related to one mother and one father ? What is proof for that? If that is case,that mean brother and sister reproduce, this is incest, so how population survived?
22flower's user avatar
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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, ...
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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
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Genetic differences between Africans and non-Africans due to cross-breeding with Neanderthals?

It is estimated that soon after the "out of Africa event" there was some interbreeding between Homo sapiens sapiens and Homo neanderthalensis. All non-African peoples are thought to have ...
Agerhell's user avatar
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2 answers
556 views

Is it possible that East Asians are a hybrid between modern and achaic humans?

As I understand it, all populations outside Africa have at least 2% Neanderthal ancestry. In eastern Asia and I think Papua New Guinea in particular that percentage could be more than 4%. Now you also ...
Agerhell's user avatar
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1 answer
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How well evolution is supported by experts? Are there acceptable scientific objection to evolution? [closed]

There are people in internet , with professional sounding voice , who claim that evolution is not scientifically possible (such as there is not enough time for evolution, or modern genetics has ...
Zeesan's user avatar
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How do we know that the DNA we share with other species (especially primates) isn't fully the result of transposable elements?

I recently read a couple studies that concluded the 25% of genetic similarity between cows and reptiles is actually primarily due to TEs (transposable elements) rather than common ancestry. Here's the ...
Mihir Dhawan's user avatar
2 votes
2 answers
85 views

Flora and fauna of early homo sapiens environment?

Where can I find as much detail as possible on the flora and fauna (and perhaps geological structures too) between the time of the origin of Homo Sapiens say ~300kya to their "out of Africa" ...
Lance's user avatar
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evolution of a preference for cooked meat

When I got a meat thermometer a few years ago, I was startled at how low optimal cooking temperatures are for beef, less that 140 degrees Fahrenheit. Also, as a kid, I remember reading that the desert ...
David Gudeman's user avatar
1 vote
2 answers
220 views

Intelligence without natural selection?

Natural selection is not the only driving force of evolution. There are other mechanisms such as genetic drift, mutations, gene flow, etc... To what extent can these different mechanisms (which don't ...
Estbot z's user avatar
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1 answer
42 views

How do we logically infer large time scales using Molecular Clocks?

If molecular clocks are uses in genetics to determine the mutation rate of genes to estimate times speciation occurred between two or more life forms, are there genes that have mutation rates that we ...
Qubit's user avatar
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4 votes
2 answers
235 views

What motivates an organism to reproduce? [closed]

What is the biological factor (gene or something else in case of humans) which motivates an organism to reproduce? By reproducing the evolutionary success of an organism increases. But why would an ...
Tarun Gupta's user avatar
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0 answers
38 views

How do we know how long speciation occured? [duplicate]

Just as we use radiometric dating to age rocks, what is the method used to age how long ago speciation occurred in genetics?
Qubit's user avatar
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1 answer
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Are babies cute, or is cute babies?

I have no doubt that the cuteness of babies is an evolutionary advantage. So the 'why' is clear, a bit of research also explains the mechanics, such as babies having certain features that trigger ...
Dennis Jaheruddin's user avatar
11 votes
1 answer
1k views

Human Evolution Chromosome 2: Fusion or Break?

I have a question regarding Chromosome 2. I've heard that there is evidence that the Human Chromosome 2 is a fusion between the two ancestral chromosomes 2a and 2b, but could it be possible that it ...
Diego's user avatar
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0 answers
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DNA from Egyptian Mummies Evolution vs Human of Today

Comment: I ask my biological questions from the point of view of mathematical proportions. I am not a biologist. Are there significant differences in DNA from Egyptian Mummies vs. those available from ...
joseluisbz's user avatar
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1 answer
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Disease-causing allele frequency and modern medicine

I was thinking about what the impact modern medicine might have on human evolution based on a couple assumptions. If we assume that: modern medicine has massively cushioned the selection pressure ...
AnethOthbo's user avatar
1 vote
0 answers
237 views

Biological reason for "deadlift face"?

Always when I deadlift at the maximum load, my face looks more or less like this: or this: The same applies for when I do other heavy-weight exercises. But what biological mechanism causes that? ...
user46147's user avatar
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0 answers
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Abilities used to survive against natural enemies: directional selection or frequency-dependent selection?

Regarding abilities used to survive predators and parasites, are they subjected more to directional selection or frequency-dependent selection? It's usually that host-parasite coevolution is ...
sterid's user avatar
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0 answers
80 views

Is the human mouth more burn-resistant than other animals which don't eat cooked food?

I burnt my mouth on some hot pizza and it got me wondering if we have been eating cooked food long enough to have evolved a better resistance to oral burns than other species. Have there been any ...
Adam Kabbeke's user avatar
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2 answers
345 views

Is there any species of mammals where males can feed the offspring with milk?

It seems to me that an evolutionary path where not only females, but also males could feed the offsprings is entirely plausible: the males anyway have niples, so it is easy for the offsprings to ...
Anixx's user avatar
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2 votes
0 answers
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Do human lungs have more protection against smoke compared to other animals?

Our ancestors have used fire for more than a million years. Wood smoke is not good for the lungs, but our ancestors were depended on fire. Especially in colder regions of the World like in Europe, ...
Count Iblis's user avatar
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0 answers
123 views

Tribes outside humanity

All humans are a group with common ancestry but some humans distinct themselves into sub-groups by "distinctive ancestry" and tend to ask other humans "where are you originally from&...
al-harumi-jidan's user avatar
-4 votes
1 answer
109 views

On the Origin of Homo Sapiens

Paleoanthropologists are certain Homo sapiens originate from Africa. However where in Africa is still contested. Could you give the reasons why it is thought that Homo sapiens evolved in Eastern ...
David Okogbenin's user avatar
1 vote
1 answer
147 views

Where in Africa did Homo sapiens evolve from? [closed]

I’m aware that the possible oldest homo sapiens fossil was found in Morocco. The vast majority of our fossils however is found in Eastern Africa. In recent years,a controversial study on mitochondrial ...
David Okogbenin's user avatar
1 vote
1 answer
85 views

Do mutations that cause the loss of a complex trait occur more often than mutations causing gain of a complex traits?

The Wiki entry on the evolution of biological complexity states that "[m]utations causing loss of a complex trait occur more often than mutations causing gain of a complex trait". There is ...
alghazali's user avatar
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1 answer
76 views

What were the three dinosaur evolutions and do they imply that bipedalism could have evolved multiple times in hominins?

At this pop-sci article transcribing an interview with Jeremy DeSilva, they state: "If we’ve learned anything about evolutionary trends, it’s that good ideas evolve over and over again. For ...
Daddy Kropotkin's user avatar
4 votes
1 answer
143 views

Which others human species/subspecies are known to have coexisted in the past with anatomically modern humans?

According to this article, interbreeding between archaic and modern humans There is evidence for interbreeding between archaic and modern humans during the Middle Paleolithic and early Upper ...
Pablo's user avatar
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3 votes
1 answer
2k views

What's the most recent common ancestor of reptiles and humans?

In the Phylogeny of humans and reptiles, what is/are some of the most recent common ancestors?
stevec's user avatar
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0 answers
31 views

What are evolutionary reasons for humans' limited regeneration abilities? [duplicate]

As far as I understand (I am not a biologist), a ability of a species arises during the evolution if: It increases reproduction chances It is not too energy expensive It is physically possible At ...
kandi's user avatar
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0 votes
1 answer
125 views

Does mitochondrial eve have to exist?

Suppose we took all living humans and found the set of their mothers, mothers' mothers, etc. and then traced down as far as possible. Is there a logical reason that this tree has to converge to one '...
user avatar
-5 votes
1 answer
103 views

How can monkeys be ancestors to people when they are herbivores? [closed]

How monkeys can be ancestors to people when monkeys are herbivores but humans are omnivorous? Maybe it is monkeys that evolved to become omnivorous gradually? How does the generally accepted theory of ...
Vladislav Butko's user avatar
0 votes
1 answer
58 views

Common ancestry of our cells to the first unicellular cell

If we start the chapter of life with low fidelity self replicating RNAs forming exactly identical copies of themselves, which then later evolved to form the first primordial basic cells which further ...
Ruchi's user avatar
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0 votes
1 answer
348 views

Evolutionary selection pressure for human hair patterns?

Are there hypotheses or conjectures that postulate any selection pressures or benefits that account for the patterns of non-pubic human hair? Particularly: Humans do not grow notable (i.e., non-...
feetwet's user avatar
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0 votes
2 answers
3k views

Why did the indigenous peoples of northern Asia and America not evolve the same physical characteristics as people of Nordic ancestry?

I was watching DW's documentary on the Arctic the other day, and I was struck by how the indigenous peoples of the far north seemed - visually speaking - to fit into two categories. On the one hand, ...
Tom Hosker's user avatar
45 votes
3 answers
14k views

Are humans more adapted to "light mode" or "dark mode"?

I was discussing with a colleague about using dark-mode vs. light mode and remembered an article arguing that humans vision is more adapted to light-mode rather than dark-mode: I know that the trend “...
Alexei's user avatar
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-5 votes
2 answers
147 views

Why do apes still exist? [closed]

If we are evolved from apes, why don't all ape evolve and become human. Or Why the today's ape stop evolving to become a human?
marya's user avatar
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3 votes
0 answers
67 views

Why is the spinal cord shortened in some vertebrates (cauda equina) but not in others?

Hodos, 2009, mentions that the "spinal cord tail" that humans have is not present in most vertebrates. This page mentions cauda equina is not present early on in human embryonic development, ...
kRicket's user avatar
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0 votes
1 answer
202 views

confusion in types and kingdom system of classification

I am a high school student and I want to ask: is the 'kingdom system' of classification (two-kingdom, three-kingdom etc.) different from artificial or natural classification? I am asking this because ...
Arun Bhardwaj's user avatar
1 vote
0 answers
96 views

What is the evolutionary advantage of breathing and heart beats syncing between partners?

I recently read that partners who are close to one another usually when touching have their heart beats and breathing in sync. Why does this occur? What is the benefit of it occurring? How does this ...
James's user avatar
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3 votes
2 answers
337 views

What motivates children to start walking?

Crawling is a way we first learn to translocate but , in all our lives, there comes a point where naturally try standing up and try to walk.. but why? What really pushes us over the edge to start ...
user avatar
1 vote
0 answers
38 views

Why didn't more muscles evolve the endurance of heart muscle? [closed]

The heart is a muscle capable of both the quick contraction of white muscle cells, and also the endurance of red muscle cells. Why haven't more muscles in the body adapted the same combo of abilities? ...
Anju Maaka's user avatar
-3 votes
1 answer
156 views

Why do humans need pillow to sleep better? [closed]

As far as I know, no animal sleeps with a pillow/support under their heads. Why then do we need to keep a pillow?
Kashmiri's user avatar
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2 votes
0 answers
53 views

Shrinking size of Y chromosomes

I read on the web that the size of Y chromosomes decreased in earlier period of time and the picture below tells that it is still occurring. So basically I want to know what caused this shrinking and ...
Ankit's user avatar
  • 231
1 vote
1 answer
706 views

Did humans evolve the ability to swim? Or is it just luck that we are able to swim?

Many animals like ducks have evolved features to be able to swim. Even not so aquatic animals like a tiger evolved so that its feet can act as paddles. In humans I don't see any direct feature that ...
user41965's user avatar
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-3 votes
1 answer
487 views

Disprove mitochondrial eve is 6500 years old

Some creationists, such as Roger Liebi, actively exploit this article: A high observed substitution rate in the human mitochondrial DNA control region (published in Nature Genetics, April 1997). This ...
Smer5's user avatar
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