If you ask any religious person who come first Adam or Eve?, She/he answer blindly that Adam come first, but from scientific view this is impossible and that is because ..
Lets check this video because I believe one video better than a thousand words.
http://youtu.be/z1Kdoja3hlk

The first known step of sexual differentiation of a normal XY fetus is the development of testes. The early stages of testicular formation in the second month of gestation requires the action of several genes, of which one of the earliest and most important is SRY, the sex-determining region of the Y chromosome. Mutations of SRY account for many cases of Swyer syndrome.
Swyer syndrome:
When SRY gene is defective, the indifferent gonads fail to differentiate into testes in an XY (genetically male) fetus. Without testes, no testosterone or antimüllerian hormone (AMH) is produced. Without testosterone, the wolffian ducts fail to develop, so no internal male organs are formed. Also, the lack of testosterone means that no dihydrotestosterone is formed and consequently the external genitalia fail to virilize, resulting in normal female genitalia. Without AMH, the Müllerian ducts develop into normal internal female organs (uterus, fallopian tubes, cervix, vagina).

A baby who is externally a girl is born and is normal in all anatomic respects except that the child has nonfunctional streak gonads instead of ovaries or testes. As girls' ovaries normally produce no important body changes before puberty, a defect of the reproductive system typically remains unsuspected until puberty fails to occur in people with Swyer syndrome. They appear to be normal girls and are generally considered so.

So Adam come as result of modification of Eve, So Eve have to be created first.

http://youtu.be/DadqEUXf4JU

This modification Chang rapidly due to smart sexual selection done by female.
the educated religious people who believe in evolution but with intelligent designer, but not by chance, argue that Adam and Eve tale is just symbolic and to explain how sin start in the world.
But didn't god know about Y chromosome , if he did then he should start the tale by creating Eve and then from Eve come Adam. I mean even the tale is symbolic it have to contain some facts.

Mitochondrial Eve:
refers to the matrilineal most recent common ancestor (MRCA) of all currently living anatomically modern humans, who is estimated to have lived approximately 100,000–200,000 years ago. This is the most recent woman from whom all living humans today descend, on their mother’s side, and through the mothers of those mothers, and so on, back until all lines converge on one person. Because all mitochondrial DNA (mtDNA) generally (but see paternal mtDNA transmission) is passed from mother to offspring without recombination, all mtDNA in every living person is directly descended from hers by definition, differing only by the mutations that over generations have occurred in the germ cell mtDNA since the conception of the original "Mitochondrial Eve".

Y-chromosomal Adam (Y-MRCA):
is a hypothetical name given to the most recent common ancestor (MRCA) from whom all currently living people are descended patrilineally (tracing back only along the paternal or male lines of their family tree). However, the title is not permanently fixed on a single individual (see below).

The age for the Y-MRCA has been variously estimated as 188,000, 270,000, 306,000, and 142,000 years. A paper published in March 2013 reported an older estimate of 338,000 years.[ Then two simultaneous reports in August 2013 provide younger estimates, one suggested 180,000 to 200,000 years, and another, based on the genome sequence of nine different populations, indicated the age between 120,000 and 156,000 years."

Source: Wikipedia
The scientific Adam and Eve never met, but their offspring met and survive which are modern human.
Scientific Adam have high survival value and scientific Eve have high sexual value, and these values inherited by their offsprings and it lead to the genetic load of existing human, while others extinct.
But there is no way that individual man and woman meet and make population because their offspring will extinct due to genetic mutation, you need at least forty different individuals to make healthy population.

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Well, yeah, I need to brush up on my booble. I only had six hours of it in college, then took another six of "comparative religion." Heavily into Hindu,Taoist, and Buddhist crazy wisdom schools (read some bizarre texts in translation, e.g. Buddhist tantric praxis involving bisexuality and the magical fluids of coitus), mostly influenced by the Hua Yin school due to ontological comparisons to quantum theory and especially David Bohm's implicate order...filtered through music of George Harrison, remembrances of temps perdu as student filmmaker and "underground" newspaper editor in L.A. during the Hot War when we smoked doobies in public parks, protested Dow Chemical in the administration building, and sent up the military-industrial-congressional complex by impersonations of officers, e.g. General Waste More Land, and General Hershey Bar, funnin' with real culprits in the then presidents' dirty little war.

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