Ok if God didn't create male and female, what evolved first a male or a pregnant female creature?

Question

FOR THE RECORD: I'm seriuos and YES I know nothing of evolution just what I have been reading lately on the web, so thats why I ask...not bashing or being cute but asking for real, thanks.

I hear about the first "cell" no one knows where it came from but that it did indeed evolve was there more then one that made it through this amazing process?

I mean did two exact creatures form at the exact same time one male one female and keep producing in each step of evolution?

Answer 1

Even the tiniest simplest creatures can mix their genes by sexual reproduction.  Bakers yeast is a great example.  Believe it or not, yeast can mate.  They don't have to but they do because under some selection pressures it's advantageous to mix genes.

Answer 2

No, according to evolution, all early animals were asexual, they reproduced at will. Later, the sexes developed.

Answer 3

I noticed you asked this in R&S, and I figured I'd point you in the direction of some good sites (that can explain it better than I can in this limited space) here in Biology (where this question belongs):

Start with these two...very basic, very broad strokes:

http://www.talkorigins.org/indexcc/CB/CB...

http://www.talkorigins.org/origins/postm...

If that doesn't satisfy, try these:

http://en.wikipedia.org/wiki/Evolution_o... (yes, it's a Wiki site, but very good sources and info that follows the sources)

http://biomed.brown.edu/Courses/BIO48/19...

http://www.nature.com/nrg/focus/evolsex/... (this lists a number of articles you can browse)

http://www.pbs.org/wgbh/evolution/s*x/ad...

Answer 4

if you're asking about sexual reproduction where there's a male and a female, they don't need to both evolve simultaneously by independent, yet identical events

why?  because by genetics, a parent passes their genes to their offspring... which are both male and female.  so, an individual gets a mutation that's advantageous... has kids, some male, some female... they have kids, some male some female, etc.  after a couple generations, you have a bunch of males and females, some of whom carry the mutated gene.  in lower organisms inbreeding happens all the time.  

it's not magic

Answer 5

Definitely not... archaebacterias were the very first organisms in the planet... since they could live in places of extremes...

If you look at this phylogenic tree... kinda like family tree where u can see the evolution of species

http://library.thinkquest.org/19012/medi...

Answer 6

I assume you're asking how to reconcile the evolution of something that requires TWO things to work.

Common (and good) question.  There are really two parts.  The key place to read up for more information beyond this answer is in studying different life cycles and reproductive strategies.

1. How did meiosis evolve?

There are haploid and diploid organisms.  The benefit of having different life cycles with differing ploidy-levels is it allows for genetic recombination.

2. How did gender evolve?

Well we begin with the gametic life cycle.  Diploid individuals produce haploid gametes, which fuse to form a zygote, which grows to become a diploid individual.  Now, the key thing is that in early organisms, gametes could fuse with any other gamets; there were no sperm and eggs.  They were all just gametes.  It'd be like a situation where a sperm could fuse with a sperm or an egg can fuse with an egg.  However, what happened was that there were evolutionary advantages to TWO different, mutually exclusive reproductive stragegies.

1. Produce lots of minimal-resource gametes.  Enough will survive to propogate your genes.

2. Produce fewer high-resource gametes.  Each has a high likelihood of survival.

However, the interesting thing about these strategies, is, while an individual couldn't follow both strategies, it was far more advantageous that a gamete from #1 met up with #2.  A biological example of division of labour.  Evolution continued with this, with differentiation, the evolution of specialized organs, co-evolution, and you end up with males (strategy #1), and females (strategy #2).