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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.
Jan
25
awarded  Custodian
Jan
25
reviewed Leave Open How did fish evolve the ability to breathe on land?
Jan
21
awarded  Custodian
Dec
28
awarded  Enthusiast
Dec
23
awarded  Yearling
Dec
21
revised How much DNA of mitochondrial origin is incorporated in main cell's DNA?
small prose clarification
Dec
18
answered How much DNA of mitochondrial origin is incorporated in main cell's DNA?
Nov
26
answered Biodiversity is restricted by genome combinatorics?
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.
Oct
1
revised Is evolution true as Darwin said?
fix unintended "yes" to "no"
Sep
30
answered Organelles present in sieve tubes
Sep
22
revised What is this awesome plant, which can close its leaves when touched?
correct typo in name of plant
Sep
7
comment Why can't cell division happen the other way around?
Think about what you just asked.