72
If this is a topic that really interests you, I'd suggest searching for papers/reviews/opinions written by Didier Raoult. Raoult is one of the original discoverers of the massive Mimivirus and his work will lead you to some truly fascinating discussions that I couldn't hope to reproduce here.
The main argument for why viruses aren't living is basically ...
49
Firstly, it's not true that you can't tell racial background from DNA. You most certainly can; it's quite possible to give fairly accurate phenotypic reconstruction of the features we choose as racial markers from DNA samples alone and also possible to identify real geographic ancestral populations from suitable markers.
The reason that human races aren't ...
35
Well, that's just it, we don't actually have much phenotypic variation. For example, compare this:
to this:
or this:
Or this:
to this:
This is phenotypic variation:
And of course, you can't beat the birds of paradise when it comes to variation (though, strictly speaking, these are different species):
So, as I hope is clear from the images above, ...
31
In short, we do not think about the uniqueness of the second part of the binomial (the species epithet) but about the uniqueness of the binomial itself (the genus and the species epithet). Thus, the unique binomial of mango is Mangifera indica and the unique binomial of bee is Apis indica. For more detail, see this question.
To complicate matters slightly, ...
30
1. Sheep are fearless
2. English common names are misleading when it comes to the genetic differences between goats and sheep
You posted a picture of Mountain Goats (Oreamnos americanus), which are a different genus than Domestic Goats (Capra aegagrus). Both Capra and Oreamnos are members of the Subfamily Caprinae, as are Domestic Sheep (Ovis aries).
...
26
The concept you are referring to is speciation and it has been well studied in a wide variety of different natural organisms. I suppose here we are talking about the biological species concept.
The overall answer is yes it is possible, but critically depends on a few different factors. The reality of speciation in the wild is very complex, but these are some ...
25
It is only a question of definition. You can set the boundaries between living things and not living things anywhere.
Some philosophers have argued that using a clear boundary between living and non-living things is not such a good solution. In nature, there would rather be a continuum from a stone to a bacteria.
It is true that in thinking of viruses such ...
20
The answer is that in general, self-naming is severely frowned upon in the scientific community, but the act itself is not disallowed.
There have been at least two instances of self-naming recorded in literature, as stated in John Wright's book The Naming of the Shrew, page 34, where Jules Bourguignat named a species of snail after himself as Ferussacia ...
18
I agree with the answers already given, these are the reasons that viruses are not considered alive. I want to point out though that this isn't an area you find 100% agreement on; there is a decent subset of biologists who do consider viruses alive. I would say - completely on the basis of personal observation - that virologists themselves are the group most ...
18
This is mostly a guess and loose suggestion, since the picture is not very clear (would need to see the larvae in more detail). However, Bagworm moths (Psychidae), Case moths (Coleophoridae) and Caddisfly larvae (Trichoptera, almost exclusively aquatic) all build similar cases. They construct their cases out if silk and often include debris, pebbles and ...
17
Basically just search "thing you want" and "phylogeny" and you'll find a million results on Google. For you, I might recommend the Botanist in the Kitchen blog, which has a whole page on the subject and has assembled this phylogeny, including many, many others. It's pretty impressive!
16
I decided to summarize a competing hypothesis to make our answers more balanced. I also tried to address the question about the degree of human morphological diversity compared to other animals.
According to Woodley (2010), it is plausible that H. sapiens does not belong to one species and subspecies (i.e. is polytypic). Some of the data he uses to support ...
16
3. is right thing to do. You can mention in the introduction that "Campylobacter fetus, which was previously known as Vibrio fetus [Ref] ........."
You should not use the old name anywhere again (also for the sake of consistency), once you have made it clear that the species was renamed, in the Introduction.
I don't think there is any written convention ...
15
No. Nobody considers red blood cells to be prokaryotic, perhaps most importantly because they are part of a eukaryotic organism. Red blood cells begin life with the full complement of organelles, including a nucleus and mitochondria, but our RBCs shed their organelles during maturation. In actuality, though, only mammalian RBCs lack nuclei; other animals' ...
15
There are quite some different definitions of being "alive", but a common one includes the need to have responsiveness, growth, metabolism, energy transformation, and reproduction (found from the Encyclopedia Britannica). Viruses depend on host cells to do all this, so seen alone as a virus outside a host cell, they are not alive.
There's another short, but ...
14
The plant is of Lamiaceae family and its common name is Shell Flower or Bells of Ireland.
Its "scientific" aka latin name is Moluccella laevis.
13
You are correct that the reason is similar to that of convergent evolution of the eye.
Both snakes and legless lizards are lizards (Squamata) that have lost their legs. However they have done so entirely separately much as octopus and human eyes have evolved entirely separately. An easier analogy is between whales and sea cows. Both are legless mammals but ...
13
There is an International Commission on Zoological Nomenclature, to which submissions for new organisms' names is strongly recomended. The discoverer does have some leeway within this system if there is no Latin name that well-describes this species. Your example is one of many.
Chapter 31, for example, clearly states:
31.1.1. A species-group name, if a ...
12
You should also bear in mind that the fact that they are great climbers does not make them fearless. For example, if I were to find myself floating 500 meters above the ground, I would be terrified. The fact that birds do not appear to be scared in the same situation does not make them fearless, it just makes them fliers.
Similarly, I am sure a fish would ...
12
The pollex was a Roman length measurement, approximately equivalent to an inch. The pollex was also known as the uncia, which is where the word "inch" comes from. There were 12 unciae in a pes ...
12
Long story short, use sequence information if you can.
The long story long:
Sequence information and the trees generated from them are strictly more reliable than morphological characters. For instance: sharks are pretty much the same shape they were millions of years ago, but they've been accumulating genetic differences 'invisibly' that allows us to group ...
12
That is the species name it is often the same for unrelated organisms, that is why we use a two name system. Binomial nomenclature (literally, two term naming system) goes Genus species respectively.
The first part of the binomial identifies the genus (which should not be the same unless they are closely related) and the second is the species name which is ...
11
Background
There are basically three highest taxonomic levels: bacteria, archaea and eukaryotes. Many sources distinguish only prokaryotes and eukaryotes, subdividing prokaryotes into bacteria and archaea. Other sources posit archaea as a third domain on the highest level. That's a long debate though and fortunately not the topic here.
By appearance, the ...
11
Bias
When you say phenotype you mostly mean "skin color", "size of the nose", "hair color", "shape of the eyes", "height", and some others. All these traits that we manage to find to explain population structure among humans. But you forget all the rest of the phenotypic diversity. If you would choose 1000 randomly chosen traits (external morphology and ...
11
There are four other instances of species-level hemihomonyms I can find:
Agathis montana can be either a critically endangered species of conifer or a parasitic insect.
Centropogon australis can be either a fish or a plant with a long red flower.
Asterina gibbosa can be either a sea star or a type of fungus
Baileya australis can be a moth or a yellow ...
10
The reason that Archaea were determined to be a separate (and only the third) kingdom so late (1977 according to this reference) was because archaea often completely resemble eubacteria. They are unicellular and have no organelles and appropriately they were grouped with other prokaryotes because of their morphology and cellular physiology.
But by the ...
10
This is a pond heron or paddy bird. The de-facto source for identifying Indian birds is Birds of the Indian Subcontinent by Richard Grimmett, Carol Inskipp and Tim Inskipp. The book is remarkably complete and contains the vast majority of species found in the Indian Subcontinent.
10
It seems to me that many answers to this question suffer from the nasty habit of "political correctness". As a zoologist, I never heard of somebody sequencing the whole DNA of any species to decide when to use or not the term "race". If a group of animals comes from a side of a river, and the other comes from the other side, and they have one or a few ...
10
In practice, subspecies are often fairly loosely-defined, reflecting a degree of uncertainty and ambiguity at this level of taxonomy. There are systematists who take the view that subspecies-level classifications should not be used as they are not rigidly definable.
In general, a subspecies will fulfil the following criteria:
it will occupy a distinct ...
Only top voted, non community-wiki answers of a minimum length are eligible
