In the first six months in the womb, all Humans were programmed to be a female. The formation of the genitals have not started, and the genes in our body confirmed us to be a female. Our bodies grew according to the command of those genes, and the hormones start overflowing in our bodies.
It's actually simply easy to see how males were once grown the same as females. There's one female feature that has developed in the fetus period and can be found on males. Nipples.
After six months long, one single gene in our body, code named Gene X (I forgot the scientific name) chose one of the two options: to be or not to be activated. This single gene is the cause of the rise of the male Humans. When it is activated, it will trigger the decrease in estrogen production and increase in testosterone. If it is inactive, the production of estrogen will be kept at higher level than that of testosterone.
If you want to see it easier, think of the walking distance from London to Moscow. That is the length of the gene that controls hormone producing if it's stretched. Gene X is the first twenty miles of the journey, where the road forked. It tells us which route we should take, male or female.
This single, important gene is actually very small. When you compare it to other genes, this one is so small and insignificant in size. For me, it is scary to understand that without a single, micro-sized gene there would never be a male Human being. In the same time I find it amazing and intriguing to know the secrets our body hold. It is amazing how something so small can make a difference so big.
What do you think?