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1answer
61 views

How do harsh conditions cause an increase in the male birth ratio?

I've heard that in harsh conditions more human baby boys are born than girls because a bigger ratio of them will die before reproductive age. But in which aspects of the random gene combination while ...
4
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1answer
108 views

Could habitat selection pattern be deformed in environment with low variability?

It is possible that strong (clearly visible) pattern of selection towards particular parameter is detectable only in environment with high variability (difference between used (red) and non-used ...
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0answers
23 views

Can paralogous genes be under negative selection?

I have just aligned 9 paralogous genes from human, uploaded them into MEGA and calculated negative selection. Can there be negative selection acting in between paralogous genes? Or how should I ...
6
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1answer
512 views

Empirical evidence for species selection

Do we have any empirical evidence in favor of species (or lineage) selection? Do we know some cases that can only be explained (or seem to be only explained) by lineage selection? What are today the ...
5
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2answers
537 views

How can sex ratios remain Fisherian (1:1) in species where only the dominant male gets to mate

In certain species only the dominant male gets to mate (or given strong preference), and yet the sex ratio remains 1:1. (I'm thinking in particular of gorillas). How does this happen? It doesn't seem ...
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2answers
122 views

Sewall Wright for dunces

[This is one more post in my growing "X for dummies/idiots/morons/etc." series.] I've been enjoying Provine's The origins of theoretical population genetics for the last couple of days, but I must ...
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2answers
305 views

Effect of zero selection (pressure) on the population health

Evolution naturally produces better features: stronger muscles, teeth and minds. Killing the weakest, evolution wipes defective genes out of populations. The mutations are necessary for advance. ...
7
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1answer
395 views

How selfish is Dictyostelium slug formation?

Dictyostelium is a slime mold which is well known for having a single cell free living phase and other some conditions (e.g. when food is scarce) for forming communal piles of cells called 'slugs' ...
2
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1answer
78 views

Are genes associated with obesity selected for?

I've read that there are several SNPs associated with increased risk of clinical or morbid obesity. I was wondering if there is any evidence that these are under positive selection. Would you expect ...