Questions tagged [human-evolution]

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

Filter by
Sorted by
Tagged with
0
votes
2answers
224 views

Is happiness or pleasure an evolutionary programming for survival?

I think that whenever we feel some kind of happiness or pleasure it is always related with improving our chances of survival, that might be temporarily or in long term, might be of only of an ...
4
votes
2answers
66 views

Evolution - The ability to control ear muscles

Among animals the ability to control ear muscles is pretty common, but only a few humans have the ability. Is it because we in general lost this ability ?
2
votes
0answers
45 views

Around what time did dark skin disappear from Europe?

As Europeans gradually became lighter skinned, there would have been people that still had dark skin. Around what time period did Europeans become completely light skinned?
2
votes
2answers
248 views

Why do I have two kinds of pubic hair? [closed]

I feel silly even asking this question, but there's a quirk of my anatomy that I find interesting, and I can find nothing about it online. I am looking for information on whether this quirk is ...
-1
votes
2answers
489 views

Why haven't humans evolved to fly? [duplicate]

Why haven't we evolved the ability to fly? I mean, it is advantageous when you take into account how many predators and parasites exist on the land, and there may be less or no dangers from birds up ...
-2
votes
1answer
103 views

Is cruelty a human instinct? [closed]

I had started studying human behaviour and human instincts a few months ago, earlier the question was raised after seeing human behaviour with animals (his prey). Animals hunt their prey for eating, ...
0
votes
1answer
131 views

Proof of Darwinism( fossil records) [closed]

What logic do anti-darwinists provide for refuting the proofs( by proof I mean the fossil records) of darwinism ? Is it the missing links? If yes then , what do they make of the fossils which are ...
1
vote
1answer
116 views

What is the biological/evolutionary advantage to baldness? [duplicate]

Male pattern baldness is a common genetic trait. With a distinctive pattern/ density gradent (as apposed to general old age thinning as the body ages) Hair has an advantage of protection from the sun/...
2
votes
0answers
50 views

What natural defence mechanism does the human body have against lead poisoning?

It is known that lead ion takes place of necessary ions, like calcium, in the body, but does not perform their task, hence wrecking the system. So how does the body eventually recognise this threat ...
-2
votes
1answer
147 views

Why hasn't evolution gotten rid of the appendix yet?

A figure I have recently stumbled upon suggests that about 7% of the world population will, or have, had appendicitis in their lifetime. Cutting out the appendix was impossible until very recently. ...
0
votes
1answer
916 views

Evolution of the (phenotypic) facial features of the indigenous people of (west/central) Africa

I am not even remotely an expert in this field; I just got curious, so help me. First of all, let us remove all human sentimental attributes from this question (such as connotations of scientific ...
1
vote
0answers
34 views

What percentage of a complete Denisovan genomes lives on in the union of the sets of overlapping pieces in extant humans

In studies like this one mapping out distributions around the world or the analysis described in this article (suggesting a contribution from a non-Denisovan but Denisovan-like unidentified hominin to ...
1
vote
1answer
353 views

Why do humans retain two kidneys?

If one kidney can function just as well as two, why do humans have two kidneys? The cost of growing two kidneys must surely be quite high, especially since one kidney is all that is really needed.
0
votes
0answers
40 views

Carbohydrate diet and dental health

I read that human started carbohydrates rich diet after adopting agriculture before that meat was main energy source which has comparatively less carbohydrate. High carbohydrate started destroying ...
0
votes
1answer
70 views

How much time does it take for an evolutionary change to take place?

I think I've read that in humans, it takes either 50,000 or 100,000 years for a mutation to fixate. But I've looked into the books I thought it mentioned it and I can't find it. I know there are ...
13
votes
2answers
868 views

Do all living humans literally descend from one ape?

In the opening chapter of Sapiens, Harari writes: Just 6 million years ago, a single female ape had two daughters. One became the ancestor of all chimpanzees, the other is our own grandmother. Is ...
-5
votes
1answer
137 views

EVOLUTION OF MAN QUESTION [closed]

I have a few questions concerning man's origins . Man has 10 vital Organs and support systems. yes or no? Man needs all 10 of his vital Organs or he dies. yes or no? . Either those 10 vital organs ...
1
vote
2answers
97 views

Books about human evolution [closed]

I want to read some books about human evolution and about other extincted types of humans. The book "Sapiens: A Brief History of Humankind" writes about history of agricultural and scientific ...
0
votes
1answer
550 views

Why don't humans typically drink human milk after infancy?

Does any human culture routinely do this? Typically taboos have some evolutionary basis. So what would that be? Does any mammal drink the milk of its own species, besides nursing?
1
vote
1answer
142 views

Endogenous retroviral insertions as evidence for evolutionary relationships among primates

A synopsis of a 2005 paper in PlosBiology by Yohn et al. states that: Searching the genomes of a subset of apes and monkeys revealed that the retrovirus had integrated into the germline of ...
1
vote
1answer
44 views

A missing endogenous retrovirus in humans, but present in gorillas and chimpanzees?

I have read an article about an endogenous retrovirus called PtERV1. It is present in gorillas and chimps, but is missing in humans (original study here). According to the article, this retrovirus is ...
0
votes
3answers
115 views

How do our sensory organs work automatically without our conscious effort? [closed]

I wonder how our different sensory organs (e.g., eyes, nose, ears, etc.) work automatically without our conscious efforts or without our command. We don't have to tell our eyes how to see, our ears ...
1
vote
2answers
3k views

Is there enough vitamin B12 in lakes, rivers and ponds, for humans not to need to take supplements?

Vegans will often say that having an animal-free diet is best for our health and is actually the diet that humans should be eating to function optimally. To which meat eaters will raise the issue of ...
2
votes
2answers
112 views

“50% of the variance in antisocial phenotypes is the result of genetic factors” means what?

How can i understand the following sentence: Overall, the conclusions reached by these studies have been highly consistent in showing that approximately 50% of the variance in antisocial phenotypes ...
0
votes
1answer
30 views

Are genes known or at least conjectured to evolve cyclically ?

I observed recently that some people born the same year in not too distant areas (say, in the same country whose size is not too big, like France) share similar phenotypical features, for example they ...
0
votes
1answer
628 views

Why do we need to close eyes to sleep?

Out of all our sensory organs, we need to stop taking signals explicitly only from eyes in order to sleep. Even interestingly, those who are not able to receive signals from eyes (i.e., the visually ...
2
votes
0answers
91 views

Is there any evolutionary significance of downward facing nostrils in human beings?

The nostrils in apes and monkeys are almost at the front, but in humans nostrils (external nares) face downwards. Also a lot of non-primate mammals like goats have nostrils at the front. Is it the ...
9
votes
3answers
682 views

Human genetic diversity in Africa in comparison with the rest of the world

Background The claim ... Most of the genetic diversity in humans is in Africa ... is quite common. On Biology.SE, it is easy to find posts that make this claim. Consider for example: Do humans ...
5
votes
3answers
683 views

Why did the face of human species changed so much during the course of its evolution?

I recently watched this video which showed the evolution of facial features of the modern man https://youtu.be/-69K7E0UlBI I'm wondering what evolutionary advantage did we get by having our face ...
4
votes
2answers
1k views

Why are humans so variable in appearance

Most animals look almost identical to their peers. To distinguish lions we record the spots on their face; with whales we look at the blemishes on their tail or flukes. In other words, we have to try ...
1
vote
0answers
162 views

How did ancient human deal with biting insects like mosquitos? [closed]

How did early humans, once hairless, but before clothes and ointments. I understand that hairlessness was an advantage against parasites but it it seems like a disadvantage antagonistic for mosquitos ...
2
votes
1answer
47 views

DNA Analysis (AncestryDNA)

A recent1 AncestryDNA commercial highlights a customer who discovered that she was 26% Native American. Credit: ancestry.com/dna You can see the full commercial here. My question is, how can this ...
2
votes
0answers
573 views

Are humans getting taller, shorter, staying the same height?

This post stems from this question, and specifically this article, which was provided within a response. From what I gathered, the article attempts to make a correlation between the size of a ...
1
vote
0answers
132 views

Why do scientists hold that there is no human race? [duplicate]

It has always seemed odd to me to say that there are no human races when there are clear features that set one group of people apart from another, like skin colour and average height. It is said that ...
8
votes
2answers
2k views

Why do humans grow taller than their ancestors?

I'm taking the Introduction to Genetics And Evolution course and in the first lecture it was said that: Evolution in a biological sense is simply a change through time. And very importantly, that ...
85
votes
6answers
29k views

Are humans the only species who drink milk as adults?

I was drinking a glass of milk the other day and that got me thinking that no other animal to my knowledge drinks milk past their infant stages. One could argue that cats might but it isn't good for ...
1
vote
0answers
57 views

Sub-saharan africans (Andamanese, Semang) have the ancestral hair-type, do they also have pediculus humanus capitis lice?

Do humans with the ancestral hair-type also have pediculus humanus capitis lice? Pubic hair lice, Pthirus pubis, are adapted morphologically to cling onto coarse body hair, and originates from ...
1
vote
0answers
51 views

In this poisson distribution in olfactory receptor (OR) pseudogenes neutral mutation rate, how is the mean used?

The 2005 paper A comparison of the human and chimpanzee olfactory receptor gene repertoires describes a poisson distribution, with a mean of 0.701 From that mean, how is the gene disruption rate of ...
3
votes
1answer
961 views

Why did humans get rid of their tail in the evolution?

Most mammals seem to have tails. Even human embryos start out with a tail. But here we are with nothing but a tail bone that hurts when we trip over backwards. What is it good for? Why don't humans ...
1
vote
1answer
42 views

HAR1 speedy mutation

From wiki: Human accelerated region 1 (HAR1) is a segment of the human genome found on the long arm of chromosome 20. It is a Human accelerated region. [..] These 49 regions represent parts of the ...
4
votes
1answer
414 views

Is Homo sapiens the only extant species of genus “Homo”?

Is Homo sapiens the only species of genus "Homo" that survived?
5
votes
4answers
1k views

Why do humans not have a powerful sense of smell?

It seems like a useful ability to be able to detect many different things about, say, another organism. A lot of mammals have this ability. Why not humans? Did we evolve it out or never develop it?
1
vote
0answers
192 views

Are there hyoid bones of Homo habilis in the fossil record?

Hyoid bones have been found for Homo erectus, Homo neanderthalensis, Australopithecus afarensis, and some more hominids. Have hyoid bones been found from Homo habilis? References: Capasso, L., E ...
2
votes
1answer
381 views

Did the hyoid bone of Australipetichus afarensis have a hyoid bulla?

The hyoid bulla is present in Chimpanzee hyoid bones, and not in Humans. Does A. afarensis have a hyoid bulla?
1
vote
1answer
467 views

Why do depleted blood veins seem to appear near the surface (or skin) more frequently than blood vessels and arteries?

I could be wrong, but it seems like blue veins generally exist closer to the surface of the body rather than red blood vessels and arteries. And I'm also wondering if this is evolutionary because ...
2
votes
1answer
133 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 ...
3
votes
1answer
725 views

Why did evolution make people's skin dark?

Why do people living in the equator have dark skin? I know that Melanin acts as a protective biological shield against ultraviolet radiation. But doesn't black absorb all light in a way making the ...
2
votes
1answer
67 views

Do the recent findings of an ape-like creature in Europe with human-like teeth change the Out of Africa narrative?

http://www.telegraph.co.uk/science/2017/05/22/europe-birthplace-mankind-not-africa-scientists-find/ Two fossils of an ape with human-like teeth were discovered in Greece, and Bulgaria, and they are ...
2
votes
0answers
210 views

What is the biology behind human population dynamics?

A paradox: Human population growth looks a lot like a simple logistic growth pattern. But the simplest interpretation of logistic growth doesn't seem to fit. Is this peculiar to humans, or does it ...
3
votes
1answer
257 views

Why do people feel shame when exposed nakedly?

Why do people feel shame? Meaning the kind of shame specifically related to exposing 'private parts'. Where does it come from (i.e. social factors due to upbringing, inherent in our genes etc.)? ...