In a fetus which sex organ is developed first

Skene's glands in the female urethra are regarded as the homologues of the prostatic glands. After the separation of the rectum from the dorsal part of the cloaca, the ventral part becomes the primary urogenital sinus. Fetal development begins soon after conception. The first phase of labor — Opening During the first phase of labour, the cervix is shorten and dilated. The morula arises during the third day after fertilization and it enters into the uterus.
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Your baby’s genes determine the sex

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Your pregnancy and baby guide

The first sign you may be pregnant is missing a period. The first trimester is the time in between fertilization of the egg by the sperm conception and week 12 of a pregnancy. At this point, the soon-to-be newborn only weighs two to three pounds and is 14 to 17 inches long. The rapidly developing embryo is now called a fetus. The skin is wrinkled and covered with a white cheesy substance called vernix this protects and lubricates the delicate skin. Your sonographer will usually be able to determine the sex of your baby during your mid-pregnancy through an ultrasound.
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Development of the reproductive system - Wikipedia

The sperm and egg unite in one of your fallopian tubes to form a one-celled entity called a zygote. The immature ova originate from cells from the dorsal endoderm of the yolk sac. The BabyCentre Bulletin Get the latest parenting news, plus expert advice and real-world wisdom. The eyelids are closed and won't open for a few months yet. Urogenital folds At the ninth week, there are not yet any notable differences. Follicles undergo maturation in several developmental stages. This continues to grow caudally until it opens into the ventral part of the cloaca ; beyond the pronephros it is termed the mesonephric duct.
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Each arises on the lateral aspect of the corresponding mesonephric duct as a tubular invagination of the cells lining the abdominal cavity. The endometrial surface is lined by simple columnar epithelium composed of two kinds of cells — ciliated cells and nonciliated secretory cells. These folds are most numerous and prominent in the ampulla — the most common site of the fertilization. Once the egg is in the fallopian tube, tiny hairs in the tube's lining help push it down the narrow passageway toward the uterus. In females the gonads are the ovaries. Loud music or sudden movements will cause the baby to jerk, a startle reflex.
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