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Knowing the sex of a fetus is important when the mother is a carrier of an X-chromosome gene that can cause a disease such as muscular dystrophy. In this case, a female fetus will be free of the gene or be a carrier, but a male has a 50 per cent risk of inheriting the disease. In these cases, parents may choose to abort the pregnancy or undergo further, invasive testingwhich carries a small risk of miscarriage.

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Boy or girl? Here's everything you need to know about when you can find out the gender of your baby through ultrasound. This is one of the most common questions doctors get from parents-to-be.

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The tests have been available to consumers in drugstore chains and online for a few years, but their use has been limited, partly because their accuracy was unclear. One company, which guaranteed European doctors now routinely use the tests to help expectant parents whose offspring are at risk for rare gender-linked disorders determine whether they need invasive and costly genetic testing.

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Medical researchers at Melbourne's Murdoch Children's Research Institute have made a new discovery about how a baby's sex is determined -- it's not just about the X-Y chromosomes, but involves a 'regulator' that increases or decreases the activity of genes which decide if we become male or female. An embryo with two X chromosomes will become a girl, while an embryo with an X-Y combination results in a boy," Ms Croft said. High levels of the SOX9 gene are needed for normal testis development. Lead author of the study, Professor Andrew Sinclair, said that 90 percent of human DNA is made up of so called 'junk DNA or dark matter' which contains no genes but does carry important regulators that increase or decrease gene activity.

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Sexual differentiation in humans is the process of development of sex differences in humans. It is defined as the development of phenotypic structures consequent to the action of hormones produced following gonadal determination. The development of sexual differences begins with the XY sex-determination system that is present in humans, and complex mechanisms are responsible for the development of the phenotypic differences between male and female humans from an undifferentiated zygote.

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Although the formation of the vulva or penis of a baby starts occurring by the 6th week of pregnancy, girl and boy babies look quite similar during a first-trimester ultrasound and till about 14th week of pregnancy. By the 18th week, your doctor may be able to determine the sex of your baby if they are lying in a position that makes their genitals visible. You may also find out the gender of your baby by having non-invasive prenatal testing NIPT that is usually done at the 10th week of pregnancy.

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Embryos with XY chromosomes become boys, and those with XX chromosomes become girls. That means that all our sex organs come from the same foundations: The testes in men are equivalent to labia and ovaries in women, and the penis is the equivalent of the clitoris. At around week 7the Y chromosome signals for the start of testosterone production, and male genitalia begin to develop.

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Jamie Mastrangelo has been writing since She received a Bachelor of Arts degree in communications at Pace University where she served as managing editor of her college newspaper. She writes health and feature articles.

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