Discussion of everything related to the Theory of Evolution.
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Here's something that I put together and the truth surprised even me, and I'm used to science always being surprising!
There is a common biological mechanism present even in the simplest of multicellular organisms like Volvox and C.Elegans where the cells that exists in the colony or organism are both male and female at the same time, a hermaphrodite. They can become fully one sex or the other by either male or female side being switched off.
So there you have it, we just got started and already male and female algae are having sex together. Just need a wet enough environment for the sperm to swim through, either internal for something that lives out of water or external like the volvox. They sense the eggs being there, then go running straight for them.
At the level of complexity around half way there to us are the nematodes like C.Elegans where being an easily switchable to fully one way or the other hermaphrodite is also normal.
http://avery.rutgers.edu/WSSP/StudentSc ... worms.html
At the wormbase http://www.wormbase.org/ where they have all kinds of electronic data to crunch through and good links it appears that reproduction with a non-hermaphrodites is more fun than with themselves. Especially in other animals where being only female is also common in which case males/females would need each other more. Less lonely that way too.
Even though it seems like hermaphrodites are somehow an abnormality (as opposed to the way it is with multicellular organisms) there are a good number of them in our human population. Since its a source of gossip and ridicule it would normally be kept their and their doctors secret. But one who was a born music entertainer, appears to be making the best of what they got:
Other than being larger the lower male parts are in females just smaller or look different because it contains just eggs instead of just sperm. And even though totally useless to males, we still have nipples. And the reason is definitely more than decorative. All the mechanisms even to make big breasts to go along with them are all there, just switched off.
We have organs that in a sense have a mind of their own whose purpose in life is to produce more sex cells that when combined produce a new multicellular organism. At the conscious level of awareness it's expressed as "dreaming about sex all day" and certain anatomical functions turning-on to get ready to go at "love at first sight" even though it will only happen in their mind. There is here a feedback mechanism that goes from between the legs to the brain, then back down again. Same thing as controlling a muscle with two neurons to and from but uses hormones on each other too. Thoughts that originate from "down there" in our deepest biology that stays alive by reproducing can be expected to be very hard to stop thinking about.
When in a "relationship" with another mind and body we are fulfilling the purpose of the system which is of course highly behavior related making it possible to be attracted to the same sex or to the first sexual state where both are expressed, especially where you didn't know that they were since it's still possible for them to be "sexy". The success of finding that special person increases the confidence level all the way to the euphoric state of "love" that is so great it produces overconfidence as in it being "blind" that can have negative results.
With the hermaphrodite/male/female sexuality mechanism working the same way for algae to nematodes on up to us and our population having all three represented too co-dependence seems to be the result of the sex chromosomes being great at producing highly reproductive with each other males and females by switching one sex off but not good at all for also producing a highly reproductive hermaphrodite population which is disrupted by the added of a sex chromosome switching mechanism. With it added to the system it's up to the males and females to keep the population going, species is fully male/female co-dependant. Otherwise hermaphrodites that don't need that switching could have big families and the thought of the occasional males and females sneaking off in the woods like they do would be very disgustingly disturbing. But from what I know about behavioral preferences the biological mechanism with the "mind of its own" kicks in and they would have awful thoughts like it might be more fun than all alone with themselves all the time.
Co-dependence of genders would here simply be because of there not being a reproducing hermaphrodite population. At our level of intelligence males and females do such a good job having and rearing babies together (includes benefit of teamwork) that's all the germline sex cells need to keep reproducing on further into time. It's not something that had to "evolve" from something else with no sex it's one of the ways to switch a mechanism that by cell division has two bits of control (one being eggs the other sperm that recombine to produce new organisms) to one of four possible states with 00 being no sex and very sterile and 11 being hermaphrodite and extremely fertile (even to themselves). Male and female would correspond to the states 01 an 10 but I'll let them argue over which binary number should represent each.
It's hard for me to say that co-dependence of genders had to "evolve" when evidence suggests it dates all the way back to the origin of life and oldest known fossils of coral-like colonies while coral are sexual organisms too. It's just one of the possible states that the mechanism is set for, in part because what works for C.Elegans does not work at our level. It takes all the female that a female has just to bear a human child with such a long gestation period and energy needs. Also having to be the macho male expected to be the one to chase the bears out of the cave on top of having to eat to nourish all the male machinery and hormone system along with the babies that regularly pop out would be so physically demanding it would be biologically impossible, in the first place. Can't evolve into something that can't exist.
We are what we are because the design works real good. The self-learning genetic mechanism is very good at finding them by taking good guesses what will work even better. So it still takes a long time to get here (and exact morphology may vary) but living things like us are kept going by a deterministic mechanism that makes us all "meant to be", but like it or not makes sure we know who made who by having molecular ways to push the higher order thought buttons without caring what we think about it.
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