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There are many cultural and social factors involved in making a baby into a man or man or women woman. The early flexibility in this system is fascinating. Most cells in our man or women are destined to die. But set aside in an embryo are a few cells that retain their ability to become a whole person.

But they have a long journey to get. About wlmen weeks after conception, 50 primordial germ cells are set aside in membranes outside the embryo. They ro and make an epic march into the embryo, moving right through the embryonic gut.

These cells arrive in the embryonic gonads by six weeks. Later they receive signals that direct them to become sperm that are made in their billions throughout the life of a manor to become the 20, eggs a girl is born. Eggs and sperm are unique in that each has half the number of chromosomes as other cells. People have two copies of the human genome in every man or women cell, one from mum and one from dad.

Meiosis is the process of cell division that creates 23 chromosomes in eggs and sperm. Gonads start off as a ridge of cells on either side of the backbone-to-be at about five weeks after conception. This signal kick-starts development of testes and suppresses ovarian development. Then factors from the testis or ovary push the germ cells one man or women or the other, into developing as either sperm or eggs.

They also pump out hormones that affect the sex lincoln ne development of the embryo. The embryonic testis makes testosterone which directs male development, fashioning a penis and scrotum.

Estrogen has the opposite effect — supporting the development of female genitalia, and priming the future breasts. woemn

The human genome is cut up into 23 long DNA molecules that man or women see as chromosomes under the microscope. All babies have 22 pairs of ordinary chromosomes one swing life stlye of 22 from mum, and one set from dad. Man or women boys and girls differ in the 23rd pair of chromosomes: Boys have a single X and a tiny chromosome called the Y.

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All eggs have a single X chromosome. We know that the Y bears the testis signal, because people with only a single X are female, and people with two X chromosomes and a Y are male. Man or women the signal must come from a gene on the Y chromosome.

In the signal was pinpointed near the top of the Y chromosome. This section of the Y was present in males and absent in females who had only part of man or women Y chromosome. A gene called SRY was identified in this little bit of Y. The presence of male genitals owmen indicates that the child has a Y chromosome.

Once man or women SRY gene was identified we all thought it would be just one or two steps between SRY and the activation of other genes that make a testis. But it turns out there is a complex web of reactions controlled by at least 30 genes.

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Wimen promote testis development. Some promote ovary development. Some antagonise testis formation, others antagonise ovaries. There are also genes one example is DMRT1 that keep gonads on a clear pathway of development.

If you knock such genes out, cells in the testis start behaving like ovary cells, or cells in the ovary start acting like testis. Remarkably, this one gene SRY, through its networks and hormonal influences, affects the activity of more than 6, genes of our total 20, differently in men swinger clubs in sf women.

So males and females really are genetically very different both in the genes they have, and how active they are. A mutation in any one of the 30 genes involved in man or women womfn web of gonad-differentiating reactions can lead to sex reversal XY females or XX malesman or women incomplete gonad differentiation.

For instance, some females have a Y chromosome and an intact SRY gene, but lack the protein that receives signals from male hormones. There are hundreds of genes needed to make sperm. man or women

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Some lie on the Y chromosome near SRYbut others are on the X or scattered throughout the genome but active only man or women males. The same is probably true of making eggs. There are also many naughty gypsy girls genes involved in sexual differentiation, making organs like leicester hot woman and breasts.

Some gene variants are involved in choice of sexual partner. These gene variants are common because man or women the other sex they express as especially male-loving females and female-loving males, who seem to mate earlier and have more children.

I think the same may be true of genes that affect gender identity. Gene man or women that promote a strong male identity might not always go along with a Y chromosome, and genes that promote a female identity may be incongruously partnered with a male-determining Y.

It is extraordinary that something so fundamental and critical for species survival as sex should be controlled by such a complicated and man or women web of genes.

We have to thank evolution for providing us with such complexity, and learn to celebrate the fantastic variation that nature has ensured.

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This article is womdn from The Conversation under a Creative Commons license. Read the original article. In today's multi-media world, what makes a story spread like wildfire? Your brainwaves might man or women the answer.

Tinkering with gut microbes causes more than a man or women ache. They can wring more calories from food and boost fat cell production — all from day one. Digital Issues Buy a back issue.

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Cosmos Conversation Biology 22 September What makes you a man or a woman. Jenny Graves — broomfield massage of the Australian Prime Minister's Jan for Science — explains how man or women genes active early in life transform the embryo into a woman or a man, and that genes active later control how sex is expressed in physiology and behaviour.

Germ cells and gonads Most cells in our bodies are man or women to die.

Explore man or women physiology human behaviour gender. The Conversation is an independent, not-for-profit media outlet kan uses content sourced from the academic and research community. Looking for more science? Click here to see our subscription options. Click here to see our gift options.

Transgender people reveal how they're treated differently as a man or woman | The Independent

Recommended for you. What you might have missed: What makes a story go viral? How you can give penguins a helping hand or womeh. How bugs in your gut can make you fat or man or women Tinkering with gut microbes causes more than a tummy ache.

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