How are we a boy or a girl yes their are chromosozes but that is what we are made from how do be become?

Question

a boy or a girl

yes but then if it is read b y the chromozons ( or how ever it is spelt ) how is it decided what once we have and how it cnt be just by them

Answer 1

There are basically just a few periods in life during which sexual differences develop. But first, DNA.

It's worth noting that there is only ONE gene that determines gender. Don't think that this gene causes the hundreds of differences between men and women directly - instead it turns on and off other genes. This is an important point. Everyone has the necessary DNA (with the exception of that one gene) to be completely male or completely female.

The very first time that one sexual gene is activated occurs in the womb. Before this there are no gender differences (it would be a bit of a misnomer to think of a clump of cells as either male or female). After that point, genitalia develop differently and make up what are generally called 'primary sexual characteristics'. These are the things that make a boy different from a girl... not necessarily the things that make a man different from a woman.

The latter distinction is an important one. Since, as we mentioned, everybody has all the DNA to be either female or male, many of the things that both boys and girls have are just a set-up that only one of the genders will take full advantage of. That happens in puberty - the third major time that sex gene makes a difference (the second was just after birth, but isn't too dramatic). People then develop what are called 'secondary sexual characteristics' - those things that distinguish a man from a woman.

So men have nipples, and even milk-secreting glands, but only women generally make much use of them. Still, enough hormones can mess any of nature's plans up from time to time. Newborn babies, for example (even male ones!) sometimes secrete milk as they are awash with the hormones of being born (it's colloquially called "witches' milk"). And sometimes an irregularity in the womb or in puberty can cause someone who is genetically male to never develop a penis, or someone who is female to put on muscle and grow facial hair instead of menses. Even normal variations can cause variations in kinds of development.

It raises some valid and largely unresolved questions, I think, about what is really necessary for 'maleness' or 'femaleness', and it's a lot more common than most people suspect.

Answer 2

Whether we have XX or XY for the first couple of weeks we are all the same.Then the XY ones get a hormonal trigger that starts them developing as boys. About one in 40,000 does not, and they are XY females - look externally like women, but have no female internal organs.
It is the sperm that decides gender, as ovum are always XX.
One thing that is not understood is why transsexuals do not feel that their body is the 'right' gender, as most transsexuals are biologically perfectly 'normal'.

Answer 3

The instructions for gender tissue development is read from those x and y chromosomes.

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Answer 4

You "dontno" how to formulate your thoughts very well, my friend. Edit yourself, and then we'll discuss those pesky chromosomes. I assure you the spelling is going to be much easier to figure out.

Answer 5

Gender roles are defined to us by our parents, and society in general.

I believe you are talking about stem cells.