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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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1answer
152 views

Why is melanin black? [duplicate]

I understand that the function of melanin is to protect individuals from sunlight, and that people living in sun exposed areas are darker due to increased production of melanin. But why is the melanin ...
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1answer
199 views

Why does the right bundle branch not have any terminal filaments in the IVS of the human heart?

Dubin's "Rapid Interpretation of EKG's" briefly describes this part of human physiology but doesn't explain the reason behind it. Is there a specific advantage of the human heart having this ...
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1answer
554 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?
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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 ...
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1answer
84 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
983 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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1answer
295 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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0answers
9 views

Biological & Evolutionary Reasons for Palm (Bi)Symmetry

The fingers of the human palm exhibit a (bi)symmetrical pattern with regards to their size, in the sense that the thumb and the pinky are almost the same size, and the same holds for the index and ...
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0answers
32 views

What factors led to the evolution of humans in Africa rather than the New World?

I learnt at the zoo that the ancestor of monkeys existed in the Africa/South America supercontinent, but then took different paths once the two continents diverged: Old World monkeys lost their ...
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0answers
42 views

What is the scientific consensus on whether humans were monogamous during the period of evolutionary adaptedness?

The book The Mating Mind by Geoffrey Miller asserts, as part of its thesis, that humans were not monogamous in the environment of evolutionary adaptedness. I found the book vivid and persuasive, but ...
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0answers
25 views

How do crossbreeding with Neanderthals affect the genetic difference between ethnic groups?

I do not know exactly how much Neanderhtal/Denisova DNA non-subsaharan peoples carry around today, but I have heard figures of less than two percent in Europe, up to three percent in East Asia and ...
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0answers
51 views

Why does it seem like there is very little disparity between races in regards to intelligence

There is numerous biological difference between human races, from height to average BMI to various organ size. Oddly however there is very little disparity in regards to intelligence (when accounting ...
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25 views

Are genes for producing heterozygotic twins sweeping?

The tendency for a woman to ovulate two or more eggs at once, which may results in a heterozygotic multiple births is the way I understand it at least to some part genetic. At least since the ...
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0answers
14 views

why is multiple blunt end repairs for one sample necessary

when is it necessary to prepare more than one blunt end repair library from an ancient DNA Extract? and what does it achieve?
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0answers
25 views

Do the normal in vivo spatial growth controls, not apply to hair follicles?

The common changes in hair growth are linked to changes in the size enlarging anagen follicles achieve. According to the accepted science in tissue physiology, the in vivo growth of the anagen ...
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0answers
33 views

Why do some people have a fear of depths?

I'm asking this question on this website because I want an evolutionary reason rather than a reason of how the human brain works. In one episode of "The Nature of Things," I heard David Suzuki say he ...
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1answer
59 views

Does drying meat in the sun make digesting it easier?

I was looking into the relationships between man, fire, brain size, evolution, etc. and I learned about other methods of food preparation that eased digestion, but did not use fire. Then, this ...
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2answers
229 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 ...
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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 ...
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0answers
515 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
94 views

Why do human have continuously-growing hair on their head? [duplicate]

Why do hair continuously grow on human heads, while the same doesn't happen on other parts of the human body? Where there are hair, they only usually grow to a fixed length; but they seem to have no ...
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1answer
96 views

What makes red meat less healthy than seafood, after millennia of evolving to eat meat? [closed]

We are told that red meat is carcinogen; fish and white meat are not. What make us not "compatible" to red meat after thousands of years of evolution and meat eating, and yet seafood is opposite ?
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2answers
506 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 ...
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1answer
103 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
525 views

How far can we go in engineering our own evolution? [closed]

After recently seeing Christopher Nolan's Interstellar and reading Kip Thorne's The Science of Interstellar, I've seriously been reflecting on the challenges mankind faces in becoming space pioneers, ...
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1answer
76 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
47 views

Is there a name for survival of the fittest in a single family? [closed]

Imagine a case where the children of a bird each have a 50% chance of being born blind. But the bird always has on average 4 chicks. So on average 2 will be blind and 2 sighted. (Perhaps this could ...
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2answers
104 views

Evolution versus Creationism [closed]

If nature, or any aspects of it, are intelligently designed, how could we tell? How would we be able to test that hypothesis?
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1answer
95 views

Can the environment affect genes and adaptation in offspring?

I recently read several articles that believe that environment can affect gene expression and this change will transfer down to the children. Some theorists believe that random mutations are more rare ...
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0answers
38 views

Why are there multiple eye colors?

Human eyes vary in color between people. Why are there multiple colors? Any continuous property of the body, like arm length, varies during the evolution, there are changes between it's value of a ...
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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
105 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, ...
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1answer
96 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
38 views

What are the genetic basis for further classification of human beings? [closed]

According to anthropology, human race further gets divided in Caucasians, Mongoloids, Aboriginals, Eskimos, Red Indidians and Negro's. How far, is this classification, though maybe anthropologically ...
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1answer
73 views

Does natural selection in humans work out in “best outcomes” or do e.g. subjective biases affect it?

Does natural selection in humans work out in "best outcomes" or do subjective biases affect it? That is, how much is natural selection "guided by nature" and "guided by humans"? E.g. given "fully ...
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1answer
149 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. ...
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1answer
5k views

Why are human immune systems comparatively weaker than other animal immune systems? [closed]

Humans get sick on such a regular basis and animals will hardly ever get sick. Animals are typically exposed to the same pathogens as humans, yet a dog won't have a cold or the flu twice a year, with ...
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1answer
72 views

Why has reproduction evolved as a choice? [closed]

From an evolutionary perspective, the purpose of an organism is to pass along its genes through reproduction. However, as humans we have a choice if we want to reproduce or not. The good feeling from ...
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1answer
251 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
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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1answer
2k views

Are there different species of modern day humans? [duplicate]

I've been watching nature shows on Netflix (Wildest series) and different animals of the same "family" are actually different species. e.g. Asian elephants vs African elephants. Asian elephants are ...
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2answers
70 views

quadrupedalism in human [closed]

Recently I saw a BBC documentary on a family from a remote village in turkey where one couple has 18 children and out of which 5 are walking on four legs. These children are 28-34 yr old & have ...
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2answers
672 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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1answer
64 views

Why do we develop addiction? [duplicate]

Recently, while on the train, I saw a person not holding the handrails on purpose. He decided that playing a game with no outcome whatsoever was more important than his safety. In fact, he bumped into ...
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1answer
75 views

Has human intelligence evolved as a costly male signal?

In this video at 42:06, Daniel Dennett posits that our big brains are: The human artifice or version of the peacock's tail. Peacocks have sexual dimorphism - it's males who exhibit the costly ...
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1answer
139 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 ...