I recently read an article pertaining the gender of a child based on the living conditions of the parents.
The result was that, the harsher the conditions of living, more is the probability of a girl child. The more secure the conditions, more is the probability of a boy child.
We know through science that the gender is solely related on the chromosome contained in the sperm that impregnates the egg. But consider the hormonal conditions in the womb which may predict if the X chromosome successfully navigates or the Y chromosome successfully navigates.
The proof of such a theory was, if we consider an environment where there is threat for survivability, then it is viable for a child to be a female as it ensures the continuation of the species provided it procreates before it dies. All it requires is a single man. Doesn't matter how many women. Similarly, being a man does not guarantee survival of his genes as it depends on if he will be successful in the future.
We can observe that in countries like Russia, the birth rate of women is more. Also, in order to compete and be seductive towards the available provider, evolution has made these women grow larger breasts and wider hips etc. We all know Russian women are the most beautiful. That said, in an equatorial country like India or Malaysia or Brazil, nature can afford to have more male birth rates in order to have more variability in terms of future progeny as these are easier climates to survive. This is the reason for higher population in these regions. This is also the reason for finding petite tits and narrow hips in women here.
You may have observed that the female birth rate is more in poorer regions as it helps for hypergamy. While in richer regions, male birth rates are more as the future success of the male child is somewhat guaranteed due to the abundance of resources for him.
Behavior wise, you might have observed that a guy who grew up in a poor environment ends up acting like an alpha because he needs to for his survival. Rich guys can afford to act beta as they can afford to lose some of their wealth.
Hypergamy wise, we are completely sure that even a very very poor girl can pair up with the richest man in the world just because of her beauty. Though men have the abilities to change the world, he would probably move up just enough to be in a better position than he was, but not anything extraordinary generally.
You can also observe in families which have a very very beautiful wife that the probability of a girl child is more as it ensures heightened hypergamy. But considering a family which has an ugly wife, male births are the norm.
At the time of fertilization, it maybe said that nature acts in its best interest of survivability or survival of the fittest. So, if nature feels there is a better chance for a female child to move to the higher rungs in society, a female child is born. If nature feels there is a better chance for the male child to move to the higher rungs, a male child is born.
It all comes down to the clash between how desirable the wife is, in terms of beauty or personality, or how strong a husband is, in terms of physicality or financially or socially.
If you think nowhere in hell this guy paired up with this girl(way out of league), girl child incoming. If you feel this guy could've done much much better, either genetically or whatever, male child incoming.
A genetically dominant gene wins.
This can also come down to how the relationship between two couples is, or who is more dominant. This can be due to the fact on how much a girl loves a guy or the tingles or how insecure she is. This may alter the conditions in the uterus.
If the guy is completely in love with a girl, it is ensured that he will definitely love his daughter and he will take care of her. If the guy somewhat grudges his girl, or thinks he can do better, a boy child maybe required to convince him to stay as at least now, he may start to see himself in this little boy and stay to mentor him. Even if the father leaves, this little kid will grow up to take care of the tribe all by himself, but if it is a girl? not so much.
or, being beta ensures that you will share your resources with your son, which ensures he will share it with his partner.
The alpha or beta behavior can change over time as both of the couples get adjusted towards each other. It is seen that guys get beta over time. Also, longer presence ensures more security ensuring better security in the future which can also alter the chance of a male or female child.
I am seeing more and more proof that theory is right based on observing everyday life and the life of celebrities and regional data etc. But I have no idea how behavioral or inter relationship behavior (acting beta or alpha at the time of conception) affects this. I have no way to know, I'm still young. Discuss your experiences or your evidence or proof. It is worth giving a thought.
tl;dr: Survival of the fittest
edit: added links
https://www.researchgate.net/publication/7521059_Violent_men_have_more_sons_Further_evidence_for_the_generalized_Trivers-Willard_hypothesis_gTWH
https://www.psychologytoday.com/blog/the-scientific-fundamentalist/201101/beautiful-people-have-more-daughters
http://discovermagazine.com/2006/nov/beautiful-daughters
http://www.bbc.com/future/story/20161014-why-billionaires-have-more-sons
http://www.sciencedirect.com/science/article/pii/S0022519304005223
https://www.ncbi.nlm.nih.gov/pubmed/15935175
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