Why are there more men in the world then women?

[Banana Jelly]

Why? My school is a sausage-fest, and I do not like it at all (more then 60% are males, but 20-30% of the 40% females are attractive, so that compensates partially). My math teacher think's that there are 2 times more females then males in the world, so males are a competition in the eyes of females, which made me almost burst out in laughter. I didn't want to embarrass my teacher, so I kept quiet. 52% of the population is male, while 48% is female.

The science part get's to this. Why are there more men in the world then women? My biology teacher said that there is 1 Y chromosome in male genes, while there are 3 X chromosome in the female, so females basically outnumber males 3-1. But seems like we still beat them at birth? Why?

[Prince Odysseus]

Part of the reason (this is merely my conjecture) is the cultural practices of Eastern and Southern Asian communities which, though less prevalent than before, means the killing of undesirable daughters. Most families (still referring to Asian cultures) want to have a son in order to continue the family lineage, work, etc; something that they consider a daughter wholly incapable of doing. In China specifically, a domestic policy enacted sometime in the 70's only allows a family to have two (if I remember correctly) children if you lived in the densely packed areas of the coast and I think three if you live somewhere like Tibet. If you look on the internet you'll find some heart breaking articles that you might want to read regarding this.

[Georgy Zhukov]

The world average for men to female ratio is 1.07

https://www.cia.gov/library/publicat...elds/2018.html <-- at the bottom.

[Banana Jelly]

Correct. For every 100 females, 105 males are born, but why this disparity?

[Viking Prince]

Correct. For every 100 females, 105 males are born, but why this disparity?

Genetics? Baby females are stronger in the womb? Abortion sex selection? Bad counting?

btw -- ask you math teacher where he gets his information.

[SinerAthin]

Heh, in my country, there's actually more females than males ;P

[removeduser_052420]

Simple. Sons are preferred to daughters. Especially in Asia, which forms the majority of the world's population. There you go.

[Banana Jelly]

Genetics? Baby females are stronger in the womb? Abortion sex selection? Bad counting?

btw -- ask you math teacher where he gets his information.

Simple. Sons are preferred to daughters. Especially in Asia, which forms the majority of the world's population. There you go.

But is Asia such a craphole, and abortion selection that bad that it out-numbers men who die in wars though? Through out history and even now, most of the army is just male (14% of the army of US is female), and most who die are males.

[Theseus1234]

Simple. Sons are preferred to daughters. Especially in Asia, which forms the majority of the world's population. There you go.

You can't really choose the sex of someone in the womb though unless you choose to abort a baby based on gender.

[Banana Jelly]

Simple. Sons are preferred to daughters. Especially in Asia, which forms the majority of the world's population. There you go.

Oh, and Bangladesh isn't apart of it Bangladesh has one of the highest female population (in ratios) compared to all the other countries in South Asia, and Asia itself. Proud to say we don't get involved in such barbaric acts as much

[Tankbuster]

One of the reasons for it seems to be that the Y-chromosome (being a sort of mutated X-chromosome) is slightly smaller than the X-chromosome. This leads to sperm cells carrying Y-chromosomes to be slightly lighter in terms of the weight they have to carry, and it gives them a small edge over sperm cells who have to carry an X-chromosom.

Obviously this small difference isn't enough to make the Y-chromosomes always get to the egg first, but it's enough of a difference to be statistically significant.

[Mangalore]

..
The science part get's to this. Why are there more men in the world then women? My biology teacher said that there is 1 Y chromosome in male genes, while there are 3 X chromosome in the female, so females basically outnumber males 3-1. But seems like we still beat them at birth? Why?

Are you sure you got that right? Chromosomes contain genes and any species has usually a constant number of chromosomes (in the case of humans 23, I think), mutations nonwithstanding.

Other than that the diversification of genders seem to have been adapted by organisms as it increases competition and thus increase genetic diversity while optimizing suvivability of the offspring as one individual is commited to it. A slight imbalance in terms of male to female offspring might be - whatever causes it - a statistically convenient counterbalance to usually higher and earlier deaths among the male population of a species as any kind of mating ritual among many species increases the health risk (colorful feathers, having to fight other males for mates, ...). It might be even just a counterbalance to the fact that men are to a certain extent less resistant to disease and several other environmental factors.

Or it is just that a small discrepancy did happen and it was evolutionary insignificant and thus stayed in the system.

[Manco]

Most Western countries have more females than males

[Vizsla]

If there is a (slight) genetic predisposition towards males it could be because males died (and still die) younger. In our hunter gather days males would have been injured when hunting. Since we settled down males tend to die in wars and higher risk professions.
In developed countries most of us don’t fight in wars and heavy industry is declining. The age of death is evening out between the sexes. It may take a while for genetics to catch up.

Indians traditionally abort or otherwise dispose of their female offspring because then they don’t have to pay a dowry if they have male offspring. In China the one-child policy has had a similar effect because parents would rather have a single son than a single daughter.
In both countries this is potentially a demographic time bomb.

[Banana Jelly]

Most Western countries have more females than males

Spoiler Alert, click show to read: 

I must say for once. This map is totally wrong. As pspguy said, Pakistan has more men, then women. It's ratio is 1.04 (I think, but it's above 1.03). Bangladesh is the only one in Asia with more women

[removeduser_052420]

Whoah wtf, why is Pakistan is so blue?

[Manco]

Hmm, That's what I get for relying on wikipedia.

Still, most Western countries have more women than men. (just checked US, UK, Germany and France in the CIA factbook)

[roy34543]

Hmm, That's what I get for relying on wikipedia.

Still, most Western countries have more women than men. (just checked US, UK, Germany and France in the CIA factbook)

This is not due to birth in fact, But due to the fact that women live longer statistically. Due to the fact that they live for several more years (and admittedly, there are less factors such as wars and dangerous jobs that they take part in to reduce their average age of death) they are represented more strongly in countries that dont discriminate between genders and allow women to reach a long life .
More men are born then women the theory goes, due to the fact that because men have more naturally dangerous jobs, natural selection favours that there be an abundance of them to equal out the ratio. In countries where the ratio is artificially affected however (people want a son and will get rid of any daughters) its obviously not well represented.

However as with many other things, evoloution is on an entirely different axis than the modern world and is inconsistent with it, which means as warfare and dangerous jobs become less common that males will statistically dominate whenever the birth rate rises, and women will be a larger percentage when it declines.

[Manco]

This is not due to birth in fact, But due to the fact that women live longer statistically. Due to the fact that they live for several more years (and admittedly, there are less factors such as wars and dangerous jobs that they take part in to reduce their average age of death) they are represented more strongly in countries that dont discriminate between genders and allow women to reach a long life .
More men are born then women the theory goes, due to the fact that because men have more naturally dangerous jobs, natural selection favours that there be an abundance of them to equal out the ratio. In countries where the ratio is artificially affected however (people want a son and will get rid of any daughters) its obviously not well represented.

However as with many other things, evoloution is on an entirely different axis than the modern world and is inconsistent with it, which means as warfare and dangerous jobs become less common that males will statistically dominate whenever the birth rate rises, and women will be a larger percentage when it declines.

I knew that, but the OP isn't solely about birth rates though.
But since he is talking about school, he should be in an age group with slightly more males. Not enough to make it a sausagefest though. That's just his hormones talking.

[squatlover]

The science part get's to this. My biology teacher said that there is 1 Y chromosome in male genes, while there are 3 X chromosome in the female, so females basically outnumber males 3-1. But seems like we still beat them at birth? Why?

Your biology teacher is saying strange things. Females are XX (2 X chromosomes) while males are XY (1 X chromosome). I hope you pass your biology exams.