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2d
comment What is the reason our body stops producing collagen/elastin?
Do you have a citation or source that asserts that elastin and collagen production cease?
Jul
3
comment Efficient algorithm to calculate various population divergence statistics
Have you looked at BioPython? Specifically the Genepop module (biopython.org/wiki/PopGen_Genepop) looks useful. If you've already got some Python experience, it might be the fastest way to get started.
Jun
26
comment Why does human hair grow over our eyes
@MattDMo Apologies. I read a non-existant "not" in there.
Jun
24
comment If dinosaurs could have feathers, would they still be reptiles?
You say "Some dinosaurs actually had feathers". I'd go further and say that every taxon that we know of that has or had feathers is a dinosaur.
Jun
23
comment Is there a name for this phenomenon described in “Phylogenies and the Comparative Method”?
@AliceD The axes are arbitrary. X and Y don't matter, nor do their units. The point is to show that the apparent moderate positive correlation between X and Y in the upper figure masks underlying structure. When you separate by 2 monophyletic clades (boxes and Xs), there is clear separation and within groups there isn't any correlation.
Jun
19
comment If dinosaurs could have feathers, would they still be reptiles?
@jamessqf Birds are reptiles as are dinosaurs. biology.stackexchange.com/questions/17546/…
Jun
18
comment What does the hominin phylogenetic tree look like?
No, it's fine as is. The tree is the tree and is (very likely) technically correct. It's just that the devil is in the details. I'm sure the bottom tree is equally poorly supported.
Jun
18
comment What does the hominin phylogenetic tree look like?
Great answer, but one thing to note about the upper tree is that the Bremer support values are really really low (0.2 to 0.5) particularly within Homo. So basically there is no resolution at that point. They may as well have a large polytomy at that point. This is not a fault of the authors but of all these fossils being fragmentary.
Jun
17
comment Why are the organs for reproduction and urinary excretion combined?
@Abram You can just edit your answer to include more information.
May
11
comment did pteranodons live in colonies?
By "Pteranodon" do you mean pterosaurs as a whole or specifically the genus Pteranodon?
May
11
comment Evolutionarily, why do male rats and horses lack nipples?
For rats at least, the answer is in your quote: because developmental sequences evolve. I don't think one need to posit an evolutionary reason for losing nipples, because in all likelihood that change was associated with some other developmental difference. And there is probably no way to know what the reason for the alteration of the timing of testosterone release.
Apr
30
comment Is homosexuality an adaptation in humans?
Also see: biology.stackexchange.com/questions/7669/…
Apr
28
comment Does the DNA of a tadpole change after it becomes a frog?
Is your question a better fit for worldbuilding.SE? If so, we can migrate it there.
Apr
27
comment Human bone density and Brown Bear bone density?
The "ash fraction" value is the key here. Bear bone is 66% mineral. Typical human cortical bone is 65-70% mineral. So, no, bears don't have denser bones than humans.
Apr
27
comment Human bone density and Brown Bear bone density?
I have to think they are using density incorrectly, and since they provide no reference, we really can't check. There is no way that bone density, in the scientific sense, can be 10 times higher in bears. It says "for a given size," which indicates to me that it must mean some kind of skeleton as percentage of body mass. Or it's just made up, with no basis in observation.
Apr
24
comment Does the term “upper extremity” include hands?
I suspect that "hand" is separated out because it is often a surgical subspeciality. Hands are complicated.
Apr
5
comment Bolyerine Snakes maxillary bone, split?
What figure(s) are you having trouble with in the paper?
Apr
3
comment The selective pressure of contraceptives
@canadianer Is there any work on novel selective pressures resulting from widespread use of contraceptives and can these selective pressures be modeled on the selective response in the same way as antibiotic resistance or strong truncating selection?
Apr
3
comment The selective pressure of contraceptives
The topic is certainly welcome. Your question was closed for being unclear rather than off topic. It would have been nice if any of those who voted to close would have explained why. I've editing the grammar a bit and given it some structure.
Apr
3
comment Why did humans evolved the scratch reflex?
Humans didn't evolve the scratch reflex. We inherited it from 350 million years of mammal ancestors.