What makes a male/female ratio equal ??

A ratio of males to females in a perticuler region is always equal or nearest to equal.
What makes this equality possible ? This means the number of male/female childs born in a period
for particuler region is always equal or near to equal. I dont think that it is possible by just a probability.
Is this controlled ? If yes then does it proves the existance of God ?

PRASH -- prash555_in@hotmail.com

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There's a 50/50 chance that any child will be male or female, so over the long term the number of males and females born will be about equal. So yes, it is possible to explain it just through the laws of probability.

 

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No, it doesn't prove the existence of a god. The notion of a god is an assumption, not a conclusion. Though some dolts will bomb themselves to have you believe otherwise.

Yes, exactly as someone said. An uneven gender ratio will only last one generation, because the next generation has a 50/50 chance of either gender. Thus, the next generation's gender ratio will be even.

This is assuming humans don't regularly tamper with the natural birth process. If, for example, some lesbian society finds out how to create artificial sperm and doctor each baby to be a female, and keep it up every generation, the gender ratio can't help but be tipped some other way.

I'm guessing.

 

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There's actually more girls then guys in the world. But it is a pretty small percentage...

 

Continue of what TruthSeeker said:

That percentage is growing for some reason though. It is like a 51/49 ratio now.

 

The development of artificial sperm has already been achieved Naomi:

http://www.ananova.com/news/story/sm_430602.html

Also, the ability to manipulate gender in vitro has been around for many years.
Interestingly, it's the Americans who do most of the work like this....

 

Of course theres more women than men,, women live a few years longer longer and men do all the dying in wars

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TruthSeeker
Blazin billy

what are yet to gain are the accurate gender population from china and india
as both of those countrys have an ingrained society where males are prefered above females and females have been killed in vast numbers
soo
considering those two countrys combined have a fairly large percentage of the worlds population .. i suspect the figures are vastly different than what those two countrys may want others to know.
and the world press is most unlikely to get the real figures for a long time also
and those wil only be a gues, as (population)-Census's in such countrys are most likely not very accurate.

 

No actually,

the male-female ratio is an evolutionary arms race. In humans there is a truce at 50-50%, or around that percentage. But sex ratio can be influenced. Look at many other species where it isn't 50-50.

 

I just assumed he was talking about humans, since it's the 'human science' forum.

 

ok.........during the creation of a baby, daddys sperm mixes with mummys Egg, mummys egg only contains X chromasones and daddys sperm contains either X or Y
simple maths tells us that:
a baby can either be:
X from the mother
Y from the father
A BOY
X from the mother
X from the fater
A GIRL

there are more or less the same ammount of boys and girls BORN but who was the last girl you knew who wanted to know what the inside of a microwave looks like when its on, or if they can go down the stairs on their hands or not.....in short us boys are stupid and keep dieing......

 

Still, that doesn't mean that the ration is equal because of statistics. It has other reasons. I will try to look up a reference but I can't right now.

 

I see what you mean. I only meant to say that because the chance of an given child being male or female is about 50/50, the fact that we have approximately equal numbers of men and women is in line with what statistics would predict, contrary to what the guy said in the first post.

 

this one is interesting.

Rather, Majerus describes a different role for bacteria in the sex life of animals: symbiotic bacteria have an interest in inhibiting the sex life of certain animal species, or in shifting the sex ratio towards one sex, typically female. Hard to believe, but an evolutionary arms race takes place with the microbial symbiont manipulating the sex determination system of its host for its own interests. What are these interests? The host clearly aims to produce as many males as females, as this represents an evolutionarily stable ratio. However, the microbial symbiont is not interested in individuals that produce sperm, as it cannot be transmitted through sperm into a zygote and therefore vertically into the next generation of hosts. It can only sneak into the following generation through the large female egg. Indeed, the sex of an individual that is predetermined by their sex chromosomes can be changed (typically from male to female) under the influence of microbes.

a good question:

And why are there as many males as females in a sexually reproducing population when a handful of males would be sufficient to guarantee survival?

and this abstract made me remember of what I really was thinking of:

Heredity. 1994 Sep;73 ( Pt 3):233-43. Related Articles, Links

Embryonic growth and the evolution of the mammalian Y chromosome. II. Suppression of selfish Y-linked growth factors may explain escape from X-inactivation and rapid evolution of Sry.

Hurst LD.

The mammalian Y chromosome may be an attractor for selfish growth factors. A suppressor of the selfish growth effects would be expected to spread were it to have an appropriate parent-specific expression rule. A suppressor could act by boosting the resource demands of competing female embryos. This possibility may explain incidences of the escape from X-inactivation and provides a rationale for why these genes typically have Y-linked homologues. Alternatively, a suppressor could act to decrease the resource demands of males with the selfish Y. This possibility is supported by the finding that the size of male, but not female, human infants is negatively correlated to the number of X chromosomes. A protracted arms race between a selfish gene and its suppressor may ensue. Both the variation in copy number of Zfy and the unusually fast sequence evolution of Sry may be explained by such an arms race. As required by the model, human Sry is known to have an X-linked suppressor. Preliminary evidence suggests that, as predicted, rapid sequence evolution of Sry may be correlated with female promiscuity. The case for fast sequence evolution as the product of maternal/foetal conflict is strengthened by consideration of the rapid evolution of placental lactogens in both ruminants and rodents.

That there can be genes on the Y and X chromosome that influence the growth of either female or male fetus, or actually stunt the growth. These genes then act selfishly. Genes on the Y chromosome (because it is paternal) will stimulate the growth of the male fetus, genes on the X chromosome will try to compensate for it.

And then there is of course an arms race between mother and fetus. The fetus might want to grow bigger, but that would involve more risk for the mother, so she will try to keep it smaller.

I haven't found the original source I came accross some time ago. Maybe it was a book I was reading.

 

He/she probably wants to know why the chance of being male or female is 50/50. U probably know that urself now

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Hum this is all very interesting and senseless at the same time but here is a monkey wrench to throw into the mix of it all, scientist have found that in about 99% of all older plastics there has been a release of synthetic estrogen hormone that up till now has been severely over looked!
Now many studies have fallowed this into the reasons for savvier decline in ratio numbers between women and men at birth in specific regions. Also it is a fact that men’s ratio number will be down to ohhh about nothing in about the next 1000 years, and yes expect this to speed up with the advent, and acceptance of gender choosing and expressed hate toward specific genders right around the corner. Can we say gender racialism? lol oh well we men are stupid anyways as we just keep inventing our self’s out of existence!

 

I believe in choice, so
A. Please shut up
B. Please go away
C. Not be stupid

 

More interesting/useful will be to know: How modern lifestyle & environment can effect/influence this sex/gender ratio say 50-50%?

 

Apparently big cities have more females than males. And rural areas the other way around.

 

It is very important to understand it that why big cities have more females than males and rural areas the other way around? These can be related to pH?