Changes in the heritable attributes of populations of organisms over time. Major mechanisms include drift, natural selection, mutation, and gene flow (migration).

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27 views

Regarding the relation of observed human nature with evolution and/or genetics [closed]

Can the behavior/psychology of a human be genetic or is it an acquired trait?
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1answer
76 views

Life on other planets [duplicate]

first of all I'm not sure if I should post this here or in the astronomy stack. I think biologist are more likely to answer my question. To make it short: Why when looking for any sort of life on ...
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1answer
61 views

Additive genetic variance with $n$ loci

The genetic variance of a quantitative trait (the quantitative trait in question is fitness) can be express as the sum of two components, the dominance and additive variance: $$\sigma_D^2 + ...
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1answer
97 views

Additive genetic variance with $n$ alleles

The genetic variance of a quantitative trait (the quantitative trait in question is fitness) can be express as the sum of two components, the dominance and additive variance: $$\sigma_D^2 + ...
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2answers
85 views

Why do we find nature 'beautiful', from an evolutionary perspective?

Most people I know find nature beautiful and holidays generally involve a place that has 'natural beauty'.
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1answer
25 views

Could mating/recombination be responsible for evolution of entirely novel features?

The diploid chromosomal architecture is rather interesting. For example, because of diploidy we Humans have to mate. Of course in that sense, because diploid organisms often have mate, this has led to ...
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1answer
30 views

What indices can we use to describe fitness landscapes?

We usually talk of smooth or rugged fitness landscape. Are there any (standard) indices to measure the "structure" of fitness landscapes? For example, one might consider the mean epistatic ...
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1answer
36 views

Book on yeast reproduction, evolution and on the use of yeast as model organism

I am looking for a good book in: Yeast reproduction mating types Recombination mating type determination mechanism Yeast evolution Yeast as model organism and its use in experimental biology It ...
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1answer
209 views

Genetic variation and sensitivity of wild cabbage

1: Is it true that the genetic variation of kale plants is smaller than wild cabbage? I think so, because of human selection of the kale plants. 2: Are broccoli and cauliflower more ...
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2answers
107 views

Examples of virus originated from a living system

Do you know some examples of virus or a viroid (or a prion) that originated from a known living organism? How does the virus/viroid/prion lives? Does it paratize the organism from which the virus ...
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1answer
42 views

Variation in MHC in humans

What evolutionary process lead to so much variation in MHC? What is the advantage of having such variation?
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1answer
126 views

Origin of human intelligence and thought

I've been debating this topic with a friend of mine and we can't get to a common answer. She argues that we don't descend from any Chimpanzee or Orangutan because, if we did, they would also have the ...
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1answer
206 views

Cyanobacterial photosynthetic oxygen yield

I am somehow not convinced that biotic factors are solely responsible for creating 21% of atmosphere (around 40 million moles of oxygen). There may be additional issues here. Since cyanobacteria ...
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1answer
113 views

Interlocus Contest Evolution means suicide?

I was reading Matt Ridley's "Genome" book. I am trying to understand the Interlocus Contest Evolution in his X-Y chapter. I do not understand why the X and Y chromosome would want to kill each other. ...
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0answers
43 views

What is the origin of DNA? [closed]

Deoxyribose nucleic acid underpins most life on this earth. It seems to me that the structure of DNA is already reasonably complicated and a certain degree of evolution may have already occured rather ...
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0answers
33 views

How does the rate of iterations affect evolutionary outcomes? [closed]

I understand that biological creatures evolved through perhaps billions of iterations to get to where we are today. It is easy to see that the more iterations or generations, the stronger and more ...
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1answer
25 views

Testing monophyly from per site log-likelihoods without optimising branch lengths

How can I obtain per site log-likelihoods for a topology against an alignment without optimising branch lengths? (which software can I use to do this) Per site log-likelihoods can be used for various ...
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1answer
27 views

Gene duplication and subfunctionalization

I’ve been intrigued by gene duplication and want to learn more about it. I’ve read the following from here: several studies suggest that the proportion of duplicated genes retained in ...
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1answer
23 views

Are there multicellular isogamous species?

Are there multicellular isogamous species? Seeking through the examples of wikipedia I would tend to think that there are no multicellular isogamous species.
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0answers
22 views

How many traits can a multivariate breeders equation handle?

The multivariate breeders equation (MBE) by Lande predicts the change in a trait $\Delta \bar z$ (response) as $\Delta \bar z = G \beta$ where $G$ is a genetic variance-covariance matrix and ...
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0answers
26 views

What do we know about the cellular structure, processes, environment, and immediate ancestors of the last universal common ancestor (LUCA)? [closed]

I am up for all scientifically sound speculations, and sources are highly welcome. I've looked into this quite a bit myself via scholar.google, the wiki article, and /r/askscience. I'm really looking ...
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0answers
20 views

Evolutionary reasoning behind redundancy of CST and RuST

According to my neuro-anatomy class, both the Corsticospinal Tract (CST) and the Rubrospinal Tract (RuST) control upper limb movement. What the evolutionary reasoning behind this redundancy and the ...
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0answers
31 views

How likely is it that through dog breeding, tail-wagging has been disassociated with happiness?

I am not a biologist, so sorry to anybody for misinformation in this post. If I understand correctly, dogs evolved the ability to show emotions through various sounds and tail-wagging in order to ...
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0answers
34 views

Why do spiders have a leaf at the bottom of a piece of web?

I've lately seen a lot of instances where a leaf is dangling from a piece of web coming down off a tree. What purpose/s does this serve for the spider? Is it some sort of mechanism for the spider to ...
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0answers
31 views

Evolution of sexually concordant genetic variation on the X-chromosome

It was theorised in 1984 that sexually antagonistic genetic (SA) variation should more easily evolve on the X-chromosome. This is partly because female beneficial/male deleterious mutations face less ...
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73 views

Can human change its morphology or anatomy due to ecological changes?

According to Charles Darwin, as the surrounding environment changes, so changes the anatomy or morphology of a specific organism. But nowadays, humans have become very advanced in the technology and ...
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0answers
43 views

$F_{ST}$ and the genetic variance in metapopulations

From this video (21'15''), the speaker gives the following formulae in order to calculate the between and among populations genetic variance from the $F_{ST}$: $$V_{Among Pop} = 2 F_{ST}V_G$$ ...
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30 views

Series of exercices on population structure (population genetics) [on hold]

I am seeking for a series of exercices (with solutions if possible) concerning population structure. I am particularly interested in exercices that involve indices such as $F_{ST}$, $F_{IT}$, ...
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35 views

Study case of the inheritance system of Oenothera

I've been told some interesting facts about oenothera. Apparently in this species some lineages have been through some translocations and in results to these translocations and in consequence, some ...
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17 views

Propagation of tool use in primates?

There are several famous cases of great apes demonstrating a surprising degree of wherewithal in communication and tool use - even monkeys can learn some tool use from each other observationally, even ...
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24 views

Triune brain model

I have heard about the triune brain model in biology class, but my teacher does not know much about it. What I'm curious about, is this model accepted by most of the neuroscientists, or is it just a ...
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0answers
59 views

Can animals distinguish other animals? [closed]

Are animals able to tell the difference between other animals. I dont mean like a cat seeing a dog and thinking "Oh no its a dog". I mean how does prey distinguish predator or threat? Say for instance ...
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0answers
46 views

Cambrian explosion and evolutionary arms race

I've seen many times mentioned in textbooks and popular articles that a reason of the Cambrian explosion is an 'evolutionary arms race' between predators and prey. But this isn't really a sufficient ...
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0answers
31 views

Is there an evolutionary advantage for hamsters throwing up food when scared? [closed]

My hamster throws up food when scared, and from a general Google search it seems that other hamster-keepers experience the same thing. Why do hamsters do this? What advantage does it serve - now and ...
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0answers
191 views

What are the ESSs among hawks, doves, retaliators, bully and prober retaliators?

In his book "The Selfish Gene", Richard Dawkins says that retaliator emerges as an evolutionary stable strategy. But I think dove is also a kind of retaliator and so if dove increases, the hawks and ...
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0answers
31 views

How did specialized nerve-based behaviors emerge in organisms? [closed]

There are quite a lot of diversity in behaviors of animals and lesser organisms, like mating, hunting, feeding, hiding and avoiding predators. At the same time I know that many hormones like ...
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1answer
121 views

Population genetics and the fitness probability distribution. Why is the arithmetic mean all we need?

When recording change in allele frequency in diploid, bi-allelic, infinite and panmixic population we usually use this kind of equation: $\delta_p = \frac{p * q *( p (w11 - w12) + q * (w12 - ...
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0answers
98 views

Why aren't antheridia and archegonia touching?

Antheridia and archegonia are the two male and female gametangia, respectively, and they are found in bryophytes. To cause fertilization, usually a thin film of water must be present for the sperm ...
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0answers
57 views

Why did animals evolve genders? [duplicate]

The majority of animals have two genders, and both are needed in reproduction. It seems like it would be more advantageous for creatures to be hermaphrodites, since they could mate with any member of ...
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3answers
120 views

Are hens and roosters the same species?

I know that one is a female chicken and the other is male chicken. Are the chickens laying eggs considered the same species as those that we use for poultry meat? Or, are they different sub-species, ...
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8answers
577 views

How does the creative process of Biological Evolution work?

In order for nature to go from microbes to man, there needs to be new information. Where does this new information come from? It is understood that Evolution basically involves three elements. ...
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5answers
272 views

Is evolution true as Darwin said? [closed]

I was telling the theory of evolution to my friends. But they asked me for the proof. They said, we are not seeing any such transition species at present. Neither we have such evidence for evolution. ...
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3answers
216 views

Can this theory on the evolution of human appearance be flawed?

This is what a friend of mine said: When there's human offspring, it will look a rough 'medium' between the two parents, with it sharing features from the two. well if the offspring of one set ...
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6answers
2k views

What does “fit” mean in “survival of the fittest”? [closed]

What does "fit" mean in "survival of the fittest"?
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2answers
158 views

Is there any genetic similarity that defy evolution theory?

For example, say species A is common ancestor of B, and C. Species B is a common ancestor of D and E. We would expect that there will be more genetic similarity between D and E than D and C. And ...
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1answer
93 views

Does avocado and orange have a common ancestor?

While I'm eating my orange, I felt as if I was eating avocado. It might be genetic manipulations perhaps but it made me think if they have a common evolutionary ancestor. Is there?
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2answers
1k views

Genetically speaking, are dogs exactly similar to humans and chimps both?

Richard Dawkins mentions in his book The Greatest Show on Earth that dogs are exactly similar to both humans and chimps. Supposing that a cell contains the genetic similarity between 2 species, he ...
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1answer
76 views

How does Oedipus complex fit in the evolutionary theory? [closed]

This is somthing that really makes me curious. How is posible that trough a evolution process the best posible candidate is the one that falls in love whith his progenitor?
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1answer
36 views

Metapopulation structure - book recommendations

What book would you recommend me to study: the dynamics of metapopulations, the structure of metapopulations, the evolution in structured metapopulations? I am not looking for an introduction ...
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1answer
35 views

Is there any evidence that soft tissue can be preserved for 65m+ years and if not what hypotheses exist to explain it?

I read an article on howstuffworks.com and they mentioned how we have found soft tissue in dinosaurs. According to the article even Mummies and Mammoths have no soft tissue left. Is there any evidence ...