Real men only have sons.. no daughters? A curious thought.

Question

Is a man with more testosterone (an aggressive type man) more likely to have all boys/sons?

Is a man with more estrogen (a softer, more gentle type man) more likely to have daughters?

It seems quite so.. but I have no evidence. What do you think?

Answer 1

Nope.  Sperm are made 50/50  Each gets an equal chance.

In reality, the women has more control over the s*x of the offspring.  Some circumstances favor the implantation of a male embryo over a female one.

Answer 2

The gender of a child is determine by the X/Y chromosome combination at the time of conception. A man could have YY, YYY or YX chromosomes and the female has XX chromosomes, the fetus receives a chromosome from each parent, YY or YX sets  will develope a male and XX will develope a female.

Since the X is the more passive (female) chromosome, YY or YYY males may be more aggressive than YX males (real men) and since they do not have an X chromosome they do not conceive females.

Answer 3

Hmm I've never thought about that but thats interesting. It sounds like it could be possible.  

Answer 4

Testosterone and estrogen do not influence the probability of either gender.  Also, more testosterone does not necessarily make a man more aggressive.  

There was an episode of "This American Life" (National Public Radio) that dealt with the topic of testosterone levels and "manliness."  The staff members of "This American Life" each had their testosterone levels tested.  The host, Ira Glass, had the highest levels of testosterone . . . and he is g*y.

Link:  http://www.thislife.org/Radio_Episode.as...

Answer 5

<<It seems quite so.. but I have no evidence. What do you think?>>

How do you know "it seems quite so" if you haven't got any evidence?  Forming an opinion based on no evidence is rather pointless.

Updates

<<KTDykes; Upset by the idea?

You must have daughters..>>

That's also based on no evidence and is rather pointless.  It says much more about you than me.  Ask my son.

Update 2

<<Like I said, it was a curious 'thought' -- I wasn't looking to gather a blind following by my obviously offensive idea.>>

I've no idea why you describe your idea as offensive.  Still, if that's what you think...

Answer 6

Testosterone levels do not, as far as I am aware, influence the production or lifespan of X or Y-containing sperm. The odds of producing an X or Y sperm are exactly 50/50: one round of meiosis in the testes will always make 2 Y sperm and 2 X sperm.

With no evidence, what makes you say that your idea "seems quite so?" I admit, it is an appealing notion on the surface, but there is no truth to the idea when examined in more detail.

To correct Anna D: there is no such thing as a YY male. If the embryo lacks an X chromosome, it is non-viable, as there are essential genes on the X chromosome. You *do* get XYY and XYYY males, however. There was an older study which suggested they might be more aggressive than "normal" XY males, but this has been more recently called into doubt.

http://en.wikipedia.org/wiki/XYY