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Jul
24
comment Why do Shiitake mushrooms grow on logs?
Because that is the habitat and substrate of Shitake, as it the case for a large number of fungi(?). Do you want to know specifically why Shitake cannot be grown in a medium, when some other species of saproxylic fungi can be grown there?
Jul
24
revised Database of Geographic Range of Species
fixed link typo + minor language
Jul
24
revised Database of Geographic Range of Species
addition
Jul
24
revised Database of Geographic Range of Species
added tags
Jul
24
comment Database of Geographic Range of Species
What taxa are you most interested in and for what purpose are going to use the data?
Jul
24
answered Database of Geographic Range of Species
Jul
23
reviewed Reopen IC50 calculation
Jul
23
reviewed Leave Open Why does milk contained in cartons of milk expand?
Jul
23
comment X-linked inheritance
For the record, I voted to close as unclear not homework, given my comment above. If the mother is unaffected while being homozygous it is clear that the penetrance of the mutation is less than 100% (even when homozygous), and that expression might interact with other genes and/or the environment. If so, it will probably be very difficult to answer your question with the information given in the Q (i.e. "What is the chance that this son has a disease?"). Do you have any more info to add?
Jul
23
comment X-linked inheritance
To me, this is unclear. Are you saying that the mother is healthy ("normal"), while being homozygous for a disease-causing deletion? I assume that PDHA1 is located on the X-chromosome, since it doesn't make sense to call her son hemizygous otherwise (which the cryptic title also suggests)?
Jul
23
awarded  species-identification
Jul
22
revised Is this Heracleum sosnowskyi?
language fix
Jul
22
comment How to eliminate prairie dog colonies from a field?
What type of fields are you talking about (crop, grazing etc), and have you considered any other control measures (e.g. fencing or removing burrows)? Also look at Internet Center for Wildlife Damage Management: Prairie dogs (hosted by a group of US universities) which has useful advice and also weighs the costs and benefits of control measures.
Jul
22
comment Is it theoretically possible to restore the Tiger population to 100,000?
@SolarLunix My point isn't that all populations can be pooled, but that inbreeding is probably not the main factor to consider when answering this question. I agree that all populations cannot simply be pooled per se, and genetic effects might be an issue for some subpopulations. However, I doubt that inbreeding is the main problem for the survival of tigers as a species or for trying to restore tigers to much larger populations (but I might be mistaken). Also, a bottleneck is one thing (they are by definition going through one), and effects of inbreeding on population growth is another thing.
Jul
22
answered Is this Heracleum sosnowskyi?
Jul
21
comment Is this Heracleum sosnowskyi?
Where were the pictures taken? Species ID questions are very hard to answer without that info.
Jul
21
revised Is it theoretically possible to restore the Tiger population to 100,000?
minor language edits
Jul
21
reviewed Approve Why do people feel pleasure when using roller coasters / centrifuges?
Jul
21
reviewed Leave Closed Why can't we use vaccines from any given deactivated virus to protect against it's active form?
Jul
21
reviewed Leave Open Would a VR headset exacerbate myopia or could it be used to retrain the eyes?