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9h
revised Why do only two sexes exist for animals?
fix repeated word word in title
9h
suggested approved edit on Why do only two sexes exist for animals?
Aug
17
awarded  Excavator
Aug
17
revised What insect is in this photo?
reupload images from imageshack to stack.imgur before they get replaced by ads; see http://meta.stackexchange.com/q/263771
Aug
17
revised What kind of caterpillar is this?
reupload image from imageshack to stack.imgur before it gets replaced by ads; see http://meta.stackexchange.com/q/263771
Aug
17
revised What is this insect I found in Russia?
reupload images from imageshack to stack.imgur before they get replaced by ads; see http://meta.stackexchange.com/q/263771
Aug
17
suggested approved edit on What insect is in this photo?
Aug
17
suggested approved edit on What kind of caterpillar is this?
Aug
17
suggested approved edit on What is this insect I found in Russia?
May
21
comment What is the contribution of the cockroach to the ecological environment?
They make more cockroaches. They also feed things that eat cockroaches, eat things that are eaten by cockroaches, and transmit microbes that are transmitted by cockroaches. Et cetera.
Apr
10
awarded  Revival
Dec
24
awarded  Yearling
Nov
13
comment Do biological facts determine when a human fetus is considered alive and human?
@JohnDubya: ... In any case, my point wasn't about whether, or to what extent, sperm and ova are distinct from the diploid life stages preceding and succeeding them, but about whether they count as "alive". It's very hard to come up with an objective definition of "a distinct living organism" that would exclude a human sperm cell without also excluding, say, a drone bee.
Nov
13
comment Do biological facts determine when a human fetus is considered alive and human?
@JohnDubya: Each ovum or sperm cell carries half the DNA of the parent that produced them; when an ovum is fertilized, the resulting embryo inherits half its DNA from the ovum, and half from the sperm. An ovum or a sperm is thus equally related to the parent that produced it, as to the child produced from it. If you consider the child "wholly separate and distinct" from the ovum, then, by the same argument, you should also consider the ovum "wholly separate and distinct" from the parent. (Well, almost. Relatedness gets a little tricky when ploidy changes, as notably seen in social insects.)
Sep
26
comment Why do different pain killers have different effects on people?
NSAIDs are a pretty diverse group of drugs. You might find en.wikipedia.org/wiki/Diclofenac#Mechanism_of_action interesting.
Sep
24
awarded  Autobiographer
Sep
21
awarded  Custodian
Sep
21
reviewed Approve How does isopropyl alcohol disinfect less in higher concentration?
Sep
18
comment Do biological facts determine when a human fetus is considered alive and human?
In fact, by pretty much any sensible definition, the unfertilized ova and sperm are also just as alive as the fertilized embryo is. Just because these haploid gametes make up a relatively small part of the human life cycle doesn't change the fact that they move, they metabolize, and, crucially, they're capable of reproducing (by first fusing into a diploid zygote, which then grows and produces more gametes). Or, as somebody once quipped, "a chicken is an egg's way of producing more eggs."
Sep
4
comment How do birds influence brood sex ratios?
Sperm production bias will, of course, not work in birds since they have a ZW sex chromosome system, not XY. I suppose the female might be able to similarly bias ovum production, though.