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Questions tagged [evolution]

Changes in the heritable attributes of populations of organisms over time. The mechanisms of evolution are mutation, migration, drift, and selection.

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Will humans ever evolve to cope with the rising temperature of our planet? [closed]

I am a complete layman of this field(Biology).I went through an article about global temperature rise and i wanted to ask this question. Federal science agencies announced Wednesday that 2016 was ...
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What is the evolutionary or biological origin of apathy and indifference. Is it uniquely a human thing?

I believe that social apathy is one of the main reasons why changes cannot easily be brought about in contemporary society due to the general lack of interest of the public, and this has ties with ...
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Is there recent info about the hypothetical ancient two-codon genetic code?

Here is the latest I have found. link This is the basic idea: Evolution does not look ahead and make plans. It would not create a system of mRNA with giant ribosomes to create proteins, until ...
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Is there a specific terms to describe variant of existing genes in bacteria?

I have a question regarding a specific term that describes the variant of existing genes. I am analyzing whole-genome sequencing of a bacterial isolate. I found there are a large number of genes that ...
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103 views

Is it possible for a prey to become its main predator's predator?

This is actually for a worldbuilding project, but I thought I'd just ask it here as it is solely about biology. Anyway, would it be possible for a herbivore, let's call him X, that is predated by a ...
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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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39 views

Hairlessness in humans [duplicate]

I was wondering if there is a scientific consensus about why humans have evolved to have relatively little hair in comparison to other apes. I may be conflating, but the only explanation I can come ...
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EVOLUTION - mammary gland in Male [duplicate]

Eventhough men and other male animals don't need mammary glands, they are still is present in the Male body. What does that indicate ? In the initial stage of our evaluation did the Males also had ...
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Why do we have different species on the planet? [duplicate]

(Pardon if this may seem like a naive question to some.) From what I understand evolution is about finding the best way to survive. I'm wondering why did different species develop if every species ...
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108 views

Lizards Undergo Rapid Evolution: Please, tell me this is not a lie

This article states that transition from eating insect to eating plants is called and caused evolution. The article neither provides images nor swears that they are telling the truth. Has someone else ...
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Prevalence of diploid stage of the lifecycle

I wonder if there is any concise compiled information on which eukaryotic groups apart from vascular land plants, animals, ciliates and possibly higher fungi (as they have a weird mixed dominant stage ...
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Finding for evolution, comparing past flower numbers with present

In a hypothetical species of butterfly, wing spots are controlled by a single locus where BB individuals have blue spots, YY individuals have yellow spots, and BY individuals have green spots. Ten ...
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Does natural selection apply to entire populations as it does to individual organisms?

The context: the other day I was reading an article about a peculiar species of ant that when threatened by a predator would “explode” in order to help protect the rest of the colony, although it ...
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227 views

(Reference request) Formal abstract theory of evolution? [closed]

EDIT: please feel free to suggest books that are the closest you can come up with to what I'm looking for, even if it doesn't exactly overlap! I am very well acquainted with the theory of evolution ...
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How did complex and interdependent systems evolve? [duplicate]

I grew up in a very Christian household, so please excuse me if this question seems stupid, but I’m a bit confused about something about evolution. I’ve already read much about evolution and there is ...
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118 views

Why are there no endoparasitic mammals or reptiles or birds? [closed]

I am curious why there aren’t any endoparasitic mammals, reptiles or birds Endoparasite being a parasite that live In the host whereas ectoparasite lives On the host I hope this clears up confusion
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Have Polyphyodonts ever evolved from Diphyodonts?

The Wikipedia article for polyphyodont says this: Although most extant mammals are not polyphyodont, mammalian ancestors were. During the evolution of Therapsida, there was a period during which ...
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What causes the complementary copy of an RNA molecule to separate?

I have recently read an article which explains that, in the RNA World hypothesis, an RNA molecule gets 'scanned' by nucleic acid, catalysed by a different specifically-folded RNA molecule, to arrange ...
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157 views

Might new bones evolve from soft tissue? [closed]

I wonder how bones evolve where there are none. (This is the question, read the sub-questions as examples :) ) Lets take an elephant as an example. If it was adaptive for the elephant, could bones ...
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Easy derivation of Kimura's approximation for the probability of fixation of a mutation

Kimura's approximation for the probability of fixation of a mutation under selection finds recurrent use in population genetics models till date. I am trying to understand the mathematical basis of ...
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2answers
888 views

Why isn’t Haemoglobin a plasma protein, rather than being encompassed by the erythrocyte?

Erythrocytes (red blood cells) are a common feature of almost all vertebrates. What evolutionary advantage do they provide in containing haemoglobin, rather than it being just a plasma protein? In ...
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84 views

How does better sperm result in more viable offspring?

Quoting wikipedia: Greater choice and variety of mates increases a female's chance to produce more viable offspring. This led me to the question: "How sperm parameters are connected with entity ...
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Overall, for the most part, which is more important--capturing prey or surviving predators or parasites?

For animals in nature, does selection intensity tend to be stronger upon abilities used against parasites or predators or abilities used against prey? Any empirical reports would be appreciated. I ...
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Why slow worm lost ability to walk in evolution/ecology perpective?

Can lost of legs for slow worm be considered as Batesian mimicry?
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If evolution is true, how do all organisms have varying amount of chromosomes? [duplicate]

I thought genetic mutation changes genes and therefore evolution happens, but it doesn't explain how chromosomes are created/removed if the first organism had a set amount and now all the organisms ...
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2answers
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What is the conversion between r and FST?

From Schonman (2013): ...allele A can only invade under Hamilton’s condition R=$F_{ST}$ > C/B. From Harpending (2002): The best general definition of the coefficient of relation $R_{XY}$ ...
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We know archea and eukarya are more closely related but endosymbiotic theory says eukarya have evolved from prokaryotes, justify the statements?

I am confused if eukaryotes have evolved from prokaryotes then how are they more closely related to archea?
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Do mutagens ever increase the “rate of evolution”?

There are a lot of sci-fi plots where mutagens, especially radiation, cause some organism to evolve at an accelerated rate. Obviously evolution does not occur within a single organism and most of the ...
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221 views

Would this disprove the theory of evolution? [closed]

I did my philosophical homework today in which I answered the question of whether evolution could be disproved. I basically argued that one way it could be disproved was if one could prove that ...
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What is meant by phenogenotypic disequilibria?

In Invernizzi and Gilman (2015), 5th paragraph of the introduction (see below), I came across the terms phenogenotypic disequilibria and more specifically the terms of positive and negative ...
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2answers
227 views

Was lactose present in the environment before the evolution of mammals?

Are there lactose sources other than dairy products in nature? I tried to search for it but I did not find anything. The question arose because I was wondering whether lactose-utilising enzymes in ...
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1answer
95 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 ...
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26 views

Is FST convertible into r?

Would a correct interpretation of Harpending's 2002 article (http://www.humanbiologicaldiversity.com/articles/Harpending,%20Henry.%20%22Kinship%20and%20Population%20Subdivision.%22%20Population%20and%...
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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/...
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104 views

Human ancestor reproduction after chromosome fusion

I read somewhere that human chromosome 2 is the result of 2 primate chromosomes fusing together somewhere along our evolutionary journey. This is why we have 23 chromosomes while other primates have ...
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1answer
256 views

Is there a distinction between the fisherian runaway theory and Fisher's sexy son theory?

In many websites/books they are referred to as part of the same process whereby: "runaway" describing that the process continues even after traits become maladaptive the "sexy son theory" explains ...
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140 views

Usage of “lineage” over “species”

Remi.b has suggested here: The concept of species is poorly defined and is often misleading. The concept of lineage is much more helpful. IMO, the only usefulness of this poorly defined concept ...
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Is a wild-type strain more “fit” than its mutant strains?

Question's context In the context of a presentation on mathematical models for antibiotic-resistance bacteria research, someone mentioned that wild type strain (WT) are expected to be more fit than ...
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What is the type of conservation in which seed banks are an example? [closed]

Firstly I think this question is quite ambiguous (I did not come up with it) so sorry. I have only come across 4 'types' of conservation: environmental, animal, marine, and human conservation. I am ...
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76 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 ...
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1answer
103 views

Impact of Natural Selection on Population Size

I have conducted a lab with my IB Biology 11 class, regarding changes in allele frequencies within generations overseeing the natural selection of an advantageous phenotype. We were looking to ...
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What was the first known organism to exhibit muscle growth based on activity?

Being able to grow bigger muscles to match an organism's personal habits seems like a pretty nifty feature since most organs grow to one specific size, aside from some stretching. Was this a feature ...
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1answer
84 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?
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Why are worker ants not clones of the queen?

Currently worker ants of most species share only three quarters of their genetic code. It seems like worker ant clones would be better, as it would remove all genetic conflict of interest between them....
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If we sequenced the genome of every species, would all phylogenies agree?

The Tree of Life is still up for debate. Most of this debate seems to be due to a lack of genomic information, but that deficiency is decreasing rapidly with advances in technology and sequencing ...
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3answers
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In the Selfish Gene, the chapter about ESS, how do the doves spread their genes?

In his explanation of the Evolutionary Stable Strategy, in the Selfish Gene, Richard Dawkins repeats a couple of times, that a population of hawk-type males would make the ground for a dove-type ...
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1answer
34 views

What percent of e coli genes are necessary for survival?

I would like to know, in a typical e coli genome what percent of genes the organism could not survive without. That is, if all the other genes evolved except that one, the organism would not be viable....
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1answer
36 views

What kinds of animals does insular dwarfism affect and how large does an island need to be to escape it?

3 down vote favorite 1 I've been wondering about insular dwarfism, and would like to know if it only affects certain animals (Since some animals grow larger upon colonizing an island, often due to the ...
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1answer
72 views

Are the transverse septum in sharks and the diaphragm in mammals homologous structures?

Are the transverse septum in sharks and the diaphragm in mammals homologous structures? I have searched on Google Scholar and Web of Science, but haven't found substantial evidence to prove or ...
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How did evolution allow to stay a condition like the refeeding syndrome? [duplicate]

This is a syndrome where anyone that is malnourished can die if he suddenly takes way more food that what they are used to, and it's something that is extremely likely to happen to every person if he ...