# Tagged Questions

The scientific study of short- and long-term changes in the size and age composition of populations and the processes driving these changes.

330 views

56 views

138 views

### Defining: Evolutionary (quantitative) Genetics and Population Genetics

How do we define the fields that are Evolutionary (quantitative) genetics and population genetics. What set these two fields apart? Can you try to provide definitions? To my intuitive understanding, ...
43 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 ...
56 views

117 views

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: $$\sigma_D^2 + \sigma_A^... 2answers 590 views ### Initial population when i count backwards? My question is dealing with how many ancestors it took to produce me: --> to produce me it took 2 people (my parents) = (2^1) people = 2 --> one generation further included = (2^1 + 2^2) people =... 1answer 166 views ### How to calculate the effective population size (N_e) with overlapping generations? From this Source: If generations are overlapping, then the effective population size N_e does not equal the population size N. I know mathematical formulations in order to find the effective ... 1answer 80 views ### Effective population size when the population sizes varies from season to season Let's think of a species which has four generations per year and which population size changes from season to season so that the population size is 100 in summer, 200 in spring, 50 in autumn and 20 in ... 2answers 223 views ### Linkage disequilibrium with multiple alleles and loci Linkage disequilibrium \left(D\right) for two bi-allelic loci is defined as:$$D=X_{11}X_{22} - X_{12}X_{21}$$where X_{11},\ X_{12},\ X_{21},\ X_{22} are the frequencies of the haplotypes ... 1answer 97 views ### Selection on linked loci in a diploid population Letâ€™s consider two linked loci A and B that are both bi-allelic. In consequence, we have four different possible haplotypes A_1B_1, A_1B_2, A_2B_1, A_2B_2, which frequencies are X_1, ... 4answers 1k views ### What prevents predator overpopulation? I've often heard that a population, human or otherwise, will continue to grow as long as there is food available (assuming nothing else is killing them off). It makes sense: if you have food you can ... 1answer 271 views ### Why will world population keep growing if all women have only 2.1 children Why is it that, even if we were going to immediately agree that every women will not have more than 2.1 children on average, the world population would continue to grow for another 60 years? I've ... 1answer 159 views ### Hill-Roberston effects and effective population size From this article, first page, middle of the second column: Even if harmful alleles do not become fixed, they can still reduce the efficacy of selection on neighbouring loci through a process ... 1answer 161 views ### Chaos theory and population cycles of odd periodicity I have just begun to read about Chaos theory and have come across the statement that "Period three implies chaos." My question: Does any odd period imply chaos or only 3? If so, how can populations ... 1answer 558 views ### Why do genetic drift generates negative linkage disequilibrium? The very first sentence of the abstract of this article is: "In finite populations subject to selection, genetic drift generates negative linkage disequilibrium, on average, even if selection acts ... 2answers 196 views ### The Assumption of Weak Selection? I was reading this question and I failed to fully understand the introductory part of it. The OP (@Artem Kaznatcheev) says: Most analytic models like to assume weak selection because it allows ... 1answer 96 views ### Why did the yeast rise? Here are the notes I made for an experiment I was doing (I didn't put it here as it is too long) (please ignore the numbers at the end of the pdf file) The graph looks like this: As you see on ... 1answer 415 views ### Population Growth Rate Question? A population of 600 birds faced a problem of biological magnification resulting in a large number of deaths reducing their population to 350. But 230 births also took place and 21 birds immigrated ... 1answer 160 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 - w22))}{\... 1answer 133 views ### How to classify equilibrium points [closed] I have the two differential equations:$$\frac{dN_1}{dt} = N_1(2 - N_1 - 2N_2)\frac{dN_2}{dt} = N_2(3 - N_2 - 3N_1). I worked out the equilibrium points to be at $N_1 = 0, \frac{4}{5}$ and $... 1answer 667 views ### When does weak selection produce qualitatively different results from strong selection? In evolutionary game theory, it is typical to model organisms as having a base fitness that is modified slightly by the game interaction. The ratio of the game effect versus the base fitness ... 1answer 55 views ### Range of feasible coefficients in an unlimited growth model If you are given an unlimited growth model in the form:$\frac {dP(t)}{dt} = k P(t)$Obviously the population growth would never be unlimited, but let's presume for the moment that we are ... 2answers 8k views ### How many organisms have ever lived on Earth? I've looked for some information on this, but couldn't find anything useful. Has there been any noteworthy attempt to estimate the sum amount of individuals of all species that have ever lived on ... 1answer 126 views ### Vaccination and population dynamics of an epidemic I'm trying to figure out how should a vaccination model be built to correlate with population density, and I'm having problems to understand meanings of the results I receive when I apply theory on ... 2answers 1k views ### Does finite rate of increase depend on mortality of individuals in a population? As written in my lecture handouts, there two main factors in the Geometric Growth Model of populations:$R_{0}\$ is the expected lifetime reproductive output. This way, for unicellulars, for example, ...
532 views

I am somewhat new to evolutionary biology, having studied it on my free time as a computer science student. There is one particular thing that has always bothered me for which I have not seen a good ...
1k views

### How does population stability evolve?

The number of individuals constituting a population is called population size. Over time population size does not remain constant, it fluctuates to different extent over generations because of ...
376 views

### When are population dynamics models useful?

When are population dynamics models useful? There seems to have been a lot of research about it, but how does it help? If I need data about how a population will evolve under what conditions, I need ...