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1d
comment occurence of interesting phenomenon
This question appears to be off-topic because it is about bricks not produced by biogenesis.
Mar
26
comment How does the creative process of Biological Evolution work?
The Blind Watchmaker would be a good book to read, probably better than The Selfish Gene. In any case, skip The Extended Phenotype until you are well acquainted with biology and evolution.
Mar
17
comment Dimensional analysis Question
Shigeta's equation should have used "hgb" instead of "rbc". To turn 1.7g hgb into rbc, you multiply it by the .3145 hgb/rbc value. Note the dimensional units work out.
Mar
2
comment What's the point of glycolysis in fermentation?
Turning 2 ATP into 4 ATP isn't good?
Feb
21
comment Does recombination increase the additive genetic variance for fitness?
I don't think this response addresses the quote since this concerns crossing over. The quote says "bringing together favourable alleles from different chromosomes", which doesn't involve crossing over.
Feb
21
comment How does the brain know where a signal came from? What is the addressing system
If you perceive a sensation, it had a path; the signaling is indeed massively parallel. Some sensations are processed in the periphery and a derived signal sent on to the brain; The density also varies (the hands have many nerves, the back, few). There is also peripheral processing like the knee reflex. Also there are nerves that have little or no flow to the brain; see autonomic nervous system. If this answer is what you wanted, you can accept it by clicking the checkmark to the left.
Feb
14
comment why can't we digest cellulose
We don't digest cellulose; it just passes through us unchanged.
Jan
27
comment PedigreeAnalysis Genetics
The G's seem mostly ok, but you don't know that Maria's grandmother is "GG". The A/a's are messed up; you're treating the disease allele as recessive, but it's dominant (XA). [but then I have no formal training; I've never had a genetics course or even college biology.]
Jan
26
comment PedigreeAnalysis Genetics
ApothemCyte, the diagrams are concerned with both the autosomal disease and the X-linked disease; look at whether the person symbol is shaded on the left side or the right side.
Nov
8
comment Are wild cats the same species as house cats?
@fileunderwater, Yes, species is useful for thinking about how groups relate and evolve; when you want to look closely, though, it's good to remember the species boundaries are gray, not black-and-white.
Nov
7
comment Are wild cats the same species as house cats?
The "species" concept is an attempt to fit a simple human conceptual category onto a reality that is not that simple. The reality is a continuum of reproductive compatibility between an individual and any other organism rather than a binary compatible/incompatible relationship which would actually be a basis for defining "species".
Nov
2
comment Transitivity of Species Definitions
"Species" is a human rule-of-thumb, often useful but having indefinite boundaries and not a thing that actually exists. See this short section of the Wikipedia article mentioned above for a good summary.
Oct
23
comment Evolutionary Cell Structuring
Just to explicitly answer "Where are the instructions?", they are in the DNA of the cells (which tell them to secrete and respond to the morphogens that terdon speaks of). [And note terdon's point that this is just from studying cells as they exist here and now, and not related to how the cells got here.]
Oct
21
comment How to measure bacterial content
Few homes have a spectrophotometer, so this is not suitable approach "in home conditions" as was asked for.
Oct
1
comment Is evolution true as Darwin said?
The ring species is an excellent example of evolution of species. The two endpoint populations are essentially different species, and you can find the gradations between them in the ring around the globe. Remove the intermediate populations and all you have are two (related) species.
Sep
7
comment Why can't cell division happen the other way around?
Think about what you just asked.
Sep
4
comment Amount of Heterozygosity
@Bananach: Perhaps you should have a look at this question: Do apes and humans share 99% of DNA or 99% of genes? What is the difference?. If that isn't adequate, you might ask another question getting at the issue.
Aug
25
comment why is AUG the initiation codon?
DNA is a sea of nucleotides. How is a transcription enzyme going to know where to start transcribing?
Jul
28
comment Why isn't a virus “alive”?
One correction: by the suggested definition, mitochondria are alive since they have ribosomes. (See, e.g., Properties of human mitochondrial ribosomes).
Jun
17
comment Are human males and females more genetically different than members of other species?
Males and females have essentially identical genomes (differing only in the very small Y and mitochondrial chromosomes), so they essentially don't differ at all. This is true in other mammals too.