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0answers
37 views

How would inserting a nonfunctional protein impact fitness of an organism?

Producing proteins costs energy, and producing longer proteins costs more energy than shorter proteins. Producing proteins which have no function, would therefore presumably negatively impact the ...
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0answers
24 views

Why do humans lose subcutaneous fat from the extremities with age?

Why does fat tissue die and shrink on the hands, knees, and lower legs of most people as they age, even when they are overweight? In most people, their bone definition becomes much more visible around ...
2
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1answer
84 views

What to call a trait that has current utility but unclear evolutionary origin?

I'm looking for a commonly used term to describe a trait that has clear current utility but an evolutionary origin that is uncertain and that we do not necessarily wish to emphasize in our description ...
89
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6answers
19k views

Do beneficial viruses exist? If so, what examples are there?

Typically, people call viruses some kind of organic compounds that cannot reproduce autonomously and which lower the fitness of their hosts. Even the word "virus" means "venom" in Latin. But from the ...
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2answers
97 views

What problem does kin selection solve?

I'm trying to understand what problem led to a development of kin selection. The explanations I've found consist roughly of the following: The existence of some altruistic and cooperative ...
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0answers
15 views

Why would a sperm's ability to swim be correlated to the fitness of the organism it would produce upon fertilization?

It seems to be a common idea that sperm compete with one another to fertilize the egg, so that (on the balance) the strongest and highest quality sperm are the ones that succeed in fertilizing the egg....
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1answer
64 views

What is the reproductive success of a biting mosquito?

Female mosquito can lay ~50-100 eggs in each batch. It takes some time between the hatch and until the time the female mosquito bits. During this time many of them will die. What is the average ...
3
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0answers
5k views

What is the difference between absolute and relative fitness?

It's seems to me that the definition of relative and absolute fitness is not that clear. Absolute fitness[edit] The absolute fitness (W) of a genotype is defined as the proportional change ...
5
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2answers
149 views

In a fitness landscape, is fitness relative or absolute?

I was asked if the fitness of a fitness landscape is absolute or relative. Fitness landscapes are usually graphed with a fitness function that uses either phenotypes or genotypes in relation to ...
3
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1answer
775 views

Kin selection Vs altruism (social biology)

I know that this is a contentious topic and I found conflicting explanations online which is what prompted me to put his question up. In some papers, Kin selection is mentioned based off the concept ...
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0answers
228 views

Is survival probability the same thing as relative fitness?

I created a model where I calculate the survival probabilities from a Mark-recapture design. I'm wondering if I can call the survival probabilities as "relative fitness". Phenotype or genotype: $...
5
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0answers
203 views

Do animals get “unhealthily” fat in the wild?

Looking at a picture of a seriously fat cat, apparently directly nurtured by humans, popping up in a language learning app, I started wondering: do animals "in the wild" (this might be ambiguous, but ...
4
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1answer
118 views

How does natural selection process escape from local optima? [closed]

How does natural selection process escape from local optima towards global optimum in a fitness landscape during evolution?
2
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1answer
207 views

Can growth rate be used as an indicator of fitness in fish populations?

I would like to calculate selection gradients in order to gain insight into the strength and type of selection influencing my study population. (see here for review. http://jgking.web.unc.edu/files/...
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0answers
41 views

Adaptation by standing genetic variation and fitness variance [duplicate]

I've read a couple of paper on Fisher's Fundamental Theory of Natural selection that states: $W(t+1) = W(t) + Var_{W}(t)$ Given a population with some degree of genetic variability, and assuming that ...
1
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1answer
648 views

What's the difference between evolution fitness and reproductive success?

What's the difference biological fitness and reproductive success in the biological terminology?
1
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2answers
1k views

How to calculate relative fitness from absolute fitness with recapture data?

In Grant 1986, it says: For this analysis the absolute fitness of an individual id scored as 0 if it disappeared and 1 if it survived, and these scores are then ...
4
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0answers
50 views

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 ...
7
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1answer
883 views

What causes humans to be physically weak compared to animals like gorillas?

Animals like gorillas seem to have a physical fitness and muscle mass that don't depend as strongly on how much exercise they get, compared to humans. E.g. gorillas living in the wild sleep and rest a ...
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1answer
1k views

Is it possible to consciously increase or decrease your own heart beat? [closed]

By doing yoga, can we manipulate our own heart beat? Is that possible for humans?
5
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0answers
41 views

Can we predict a person's tolerance to cold exposure during excercise?

Being an amateur athlete and student of anatomy I've always wanted to know if there is a formula for determining an unconditioned body's tolerance to cold temperatures while exercising. I know the ...
5
votes
1answer
103 views

Why don't the genetic similarities between ‘unrelated’ individuals of the same and different species outweigh the differences?

Ever since starting to learn about the concept of inclusive fitness during my BSc, I've been bugged by this questions: if inclusive fitness can account for many ‘altruistic’ behaviors, why don't the ...
5
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0answers
118 views

Negative association between habitat quality and reproductive success in birds

I'm looking for bird studies that have found either a negative correlation or no correlation between habitat quality and reproductive success. Or in other words, bird studies that have found that ...
2
votes
1answer
397 views

Are there any examples of how to apply evolutionary models?

Apologies if this question it too open-ended; evolutionary biology is not my primary field. I have been reading a lot about the use of statistical mechanics in analyzing evolutionary dynamics. As an ...
1
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1answer
54 views

Which monkey species features two distinct male phenotypes?

I remember coming across a popular science article years ago about a monkey species which featured two male genotypes: the first were good looking males who acquired social status (as alphas or betas) ...
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4answers
1k views

How is it possible for the absolute fitness to be more than 1?

The wikipedia definition of Absolute fitness is "the ratio between the number of individuals with that genotype after selection to those before selection. It is calculated for a single generation and ...
2
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1answer
150 views

Is it easier to burn a calorie of fat or a calorie of a carbohydrate?

Say someone eats 100 calories of chocolate vs. 100 calories of carrots. Something tells me that eating the chocolate will lead to you generating more fat. Will it? Is it harder to burn the calories ...
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1answer
53 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 ...
7
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1answer
13k views

Under what conditions does the body burn fats, proteins and carbohydrates?

Searching the internet, I have found lots of conflicting information from various fitness sites concerning when the human body burns fats, proteins and carbohydrates. My basic understanding was that ...
6
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2answers
372 views

Measuring fitness / lifetime reproductive success (LRS) in Drosophila

I am planning a fitness assay of Drosophila melanogaster. I'd like to get a good measure of lifetime reproductive success (lrs) but I don't want to count all the offspring produced over a lifetime by ...