Questions tagged [human-evolution]

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

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2answers
257 views

Did the capacity to be “knocked out” arise because it conferred an evolutionary advantage?

From first principles, it seems surprising that a blow to the head would cause unconsciousness rather than just impaired function. I've heard a lot of analogies to computers -- "Your brain has to ...
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1answer
181 views

If I workout, will this inherited trait (of being stronger) not be passed down to my offspring (Lamarck's theory on evolution)?

I'm a student in biology and just recently learned about Lamarck's theory on evolution and how it has been disproved. While I understand that you cannot alter your genes, I'm still having a hard time ...
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278 views

growth limit on muscle

Is there any biological limit on muscle growth in human body, one can keep pushing body and keep growing more and more muscle but somewhere it must become diffcult for body to sustain those cells ...
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1answer
137 views

Lengthening muscles not good from evolutional perspective? Why do we do it with explicit stretching?

Stretching has many advantages, among other things it helps us to be flexible in our movement (which is an advantage?!). But why do we need to actively stretch, it seems that the body wants to ...
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1answer
69 views

single use traits

Are there any known traits (in any organisms) that serve exclusively one purpose? (Counterexample: Giraffes long neck help them reach less available food AND communicate sub-sonically). If so is ...
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1answer
161 views

Examples of chromosome fusions

One of the best "smoking gun" pieces of evidence of humans' close relation to chimpanzees, gorillas and orangutans is that human chromosome 2 is a fusion of two primate chromosomes, with a double ...
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1answer
45 views

Is it possible to have a mechanism to use carbon dioxide as a source of oxygen in human body?

Is it possible to seperate O2 from CO2 and use it for energy In Human? Why Plants and not Humans can do it?
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1answer
77 views

Why human endometrium doesn't stay constant? [duplicate]

Is there any explanation or evolutionary advantage to the endometrium constantly cycling between the proliferative and menstrual cycle? Wouldn't it be more advantageous if it kept always fully ...
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1answer
184 views

Reference to hypothesis about breast sexual attractiveness?

Some time ago there was a hypothesis published,suggesting evolution made breasts mimic buttocks for either primitive men being attracted to women when they started to walk on two legs, or to ...
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1answer
948 views

Why a brain's hemisphere controls the opposite side of the body? [duplicate]

As a physics student with very little understanding of biology, in a course about physics foundations diagnostic techniques I have come up with this question. I don't even know if it does make sense ...
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2answers
65 views

Is there any strong factor against human edible plants being widespread and easy to gather?

While many habitats have plants, fruits, nuts and berries available for consumption by humans walking by, most places (if any?) seem to require significantly more effort than simply picking our food ...
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Why do humans suffer anxiety when they view “Trypophobia trigger images”?

When you type Trypophobia Trigger Images in google, you see a variety of images with irregular lumps and bumps among some more gory images. Many people report that these images induce phobia like ...
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688 views

Are there genetic causes underlying the difference in circumference of the upper arm and foream?

Is there any genetic reason for the difference in size between the upper arm and lower arm (i.e., the forearm)? In most women, it seems that the upper arm is larger in circumference than the forearm. ...
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170 views

Why do female humans invest more in parental care than male humans, from an evolutionary standpoint? [closed]

As the question title suggests, why do female humans invest more in parental care than male humans, from an evolutionary standpoint? My guess is that the crux of this that males and females have ...
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0answers
46 views

How detailed a construction of the family tree of known human fossils do we have?

For the sake of this question, by "human" I mean Hominina. The best I could find is this, which isn't very detailed. Of the dozens of paleospecies we'd seek to link up, do we have a more detailed tree ...
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1answer
7k views

Does it make sense to classify all humans in a single species?

For what biological reasons do we consider that all human beings belong to the same species? A Thai and a Nigerian share a common ancestor that is 140,000 years old (see Gravel et al. 2010 and this ...
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223 views

Sex and human's sexual urge.

Why is it necessary for humans to feel pleasure while having sex? Why is it that other animals don't need to experience it? Is it evolutionary ? Why do we mate for pleasure when it's so energy wasting/...
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1answer
148 views

Can the characteristics of an offspring depend on the locality of its conception also?

Transfer of characteristics from a parent to its offspring is explained in biology. When an adult male and female (of humans) who are displaced from their local environment to another (say, a ...
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61 views

Different number of flaps in heart valves

Can anyone tell me why the different valves of heart have different number of flaps is it in any way related to evolution of homo sapiens.
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1answer
115 views

In reconstructions, how are various shapes of facial features determined from skull only?

I have seen reconstructions (with skin, eyes, muscles etc) of some first humans based on skulls and skeletons. But how can the shape of nose (protruding part), shape of eyelids, shape of eyebrow, ...
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2answers
321 views

Questions about the evolution theory [closed]

I'm not sure whether I can ask those questions about evolution in one post or should separate them into multiple posts, but I am just curious about the evolutiontheory. (I am new here) Sorry for my ...
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1answer
2k views

Do human populations differ in core body temperature?

Human body temperature is a very complex and tightly regulated system. Hypothermia or fever of only 1-2K (i.e. changes of about 5%) already cause major symptoms and changes of 3-4K (i.e. about 10%) ...
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1answer
16k views

Why do we have the tibia and fibula (a 2nd bone) in the lower leg?

Does fibula participate in rotational movement of ankle or not (just like the radius in forearm)? If not, what is the purpose of that bone?
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1answer
990 views

Why do women mature (physically) earlier than men? [closed]

All sources I've read (the first page) states that the fact that women mature (in the sense of physical maturing) earlier than man is caused by the earlier selective prunning in brain. Though, this is ...
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Online phylogenetic tree of human lineages

I am looking for a source of information about the diversity of human lineages and their relationships. With a quick google search it is easy to find this type of tree A perfect online resource ...
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3answers
282 views

Have humans finished evolving?

I thought that massive changes among organisms are over long periods of time. This is caused by, to my knowledge: Evolutionary pressure Natural/artificial selection Mutations Genetic drift Will ...
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2answers
990 views

Is there a biological basis for race (re: Nicholas Wade's article) [duplicate]

I just recently read this article by Nicholas Wade on Time Magazine's website about a biological basis for race. It all sounded very racist, but of course my Western liberal attitudes about racism ...
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1answer
98 views

Genetic entropy [closed]

One day my internet acquaintance told me, that genetic entropy can be evidence in favor of intelligent design and he also provides me this waiting time problem and this simulating evolution by gene ...
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1answer
311 views

Is bad tasting food more likely to cause harm?

Taste is often referred to as subjective. For example certain foods taste bad to me, such as oranges, grapefruit, grapes, raisins, and sweet potatoes. However the wiki article on taste explains that ...
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1answer
51 views

Is it possible to genetically alter human beings to see parts of the infrared? [duplicate]

Most electron transitions take place in the infrared region,The ability to see this part of the electromagnetic spectrum without reliance on sophisticated technology would have tremendous advantages. ...
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1answer
560 views

What do blue cone cells add to visual function?

First of all, I saw this other question in the SE sites with a good answer, but I didn't find an explanation about the blue cones specifically. So most human beings have 3 types of cones (cells ...
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1answer
32 views

Correlation between threat and odour, taste

Is there any sort of correlation between threat and taste/smell? Are we evolved such that things which are harmful to life taste and /or smell bad and things(food) which are useful to us taste, smell ...
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1answer
268 views

Is there any kind of “unintended consequence” in evolutionary systems?

In the social sciences, unintended consequences is a term used to describe an unexpected positive or negative effect of a particular action. This is obviously the wrong word to use in the context of ...
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2answers
650 views

Evolution of complex organs [duplicate]

If it evolved, how is a feature selected through a long time span with useless function before the feature becomes complete? For example, an eye is a very complex organ consisting of countless small ...
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184 views

Were Neandertals as Hairy as We Are?

What I mean to say regards facial and androgenic hairs. There are many theories as to why some people have both kinds of hairs, while others have one or the same and others still have neither. The ...
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3k views

Why aren't there any transitional animals today?

You have probably heard this question before and in different formats. Usually, it is used as a "proof" to disprove the theory of evolution. I understand that the apes we descended from are not the ...
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1answer
289 views

What percentage of a Neanderthal's DNA could be in a Denisovan?

My questions arose from an online course video at 3:11-19 The professor mentioned that the Neanderthals were inbred with their cousins breeding together but the Denisovans were very diverse , with 70%...
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1answer
98 views

Does SIV cause AIDS in primates… If not why [closed]

does SIV cause AIDS in primates or have they developed resistance to the virus **
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193 views

Have people in Africa already started evolving resistance to AIDS?

Are people living in areas where AIDS is rampant (for e.g. Africa), less likely to die from it than they once were because some of the people without genes/mutations that give them resistance already ...
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1answer
433 views

Is the “freeze response” really a remain of our reptilian past?

I'm looking for any reliable sources relating the common-known human reaction on a stressful situation, humans sometimes freeze and can not move. From some materials found on the internet I got that ...
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1answer
75 views

How big advantage had a trait have to bring to evolve in the human evolution? [closed]

Yes, I've heard that we have evolved from the common ancestor with primates as intesively, as the chimpanzees. Sometimes I read about some enormously complex traits, evolutionary psychologists think ...
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1answer
128 views

Why aren't we immune to the “cold” [duplicate]

As far as I know, people suffer from the cold since ever. Why didn't and don't we evolve to resist it?
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2answers
250 views

Infer gene frequency within a species over time

I was reading Karlsson et al. (2014) and I came into this: A selected variant that increases rapidly in frequency in the past ~250,000 years can be detected as an unusual reduction in genetic ...
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1answer
93 views

Are women smaller to optimize cloth needs during pregnancy? [closed]

Current life events made me wonder: Is it possible that female humans evolved to be on average smaller than males, so that they can reuse their partner's cloth during pregnancy? At least in my ...
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1answer
111 views

Why is there no symmetry in pigmentation when comparing people north and south of the equator?

If you are at the equator and start moving north, the further you travel, the lighter the skin of the indigenous peoples. Considering that we live on a ball, why do we not find the same traveling ...
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1answer
2k views

Brain capacity of Cro-magnon man vs Modern man

Cranial capacity of Cromagnon man was about 1650cc whereas average cranial capacity in modern human is 1450cc. My question is, why during the course of evolution, a reduction in cranial capacity is ...
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132 views

What were the Neanderthal innovations?

At some point the neanderthal and modern human lineages diverged. I'm not sure what exactly their most common recent ancestor was (I see some sources suggesting homo heidelbergensis), but in any case ...
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0answers
501 views

Is natural selection still at work in humans in the 21st century? [duplicate]

There has been some disussion on this site about some aspects (e.g. evolution of eye sight, or height, or the effect of medicine, or evolution the past $\sim10000$ years). My question is really more ...
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0answers
71 views

Why were the earliest humans hunter gatherers instead of fruit eaters living on trees?

How is it that the earliest humans who evolved from primates (who live on trees and mostly eat fruit) became hunter-gatherers (which seems like a harder, more stressful and more dangerous way to find ...
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The evolution of poor eyesight: is there weaker selection in modern humans? [duplicate]

Short question: Poor eyesight might have been a major impediment to survival and reproduction in early man (say, 100,000 years ago), but, with the advent of agriculture, major cultural changes, and ...