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A small number of pregnant women have some vaginal bleeding, with or without abdominal cramps, during the first trimester of pregnancy. This is known as a threatened abortion. Most of these pregnancies go on to term with or without treatment. Spon...
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Chromosomal abnormalities describe changes in the normal number of chromosomes or structural problems within the chromosomes themselves. These abnormalities occur when an egg or sperm with an incorrect number of chromosomes, or a structurally faulty chromosome , unites with a normal egg or sperm during conception.
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Detailed information on the most common chromosomal abnormalities
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Chromosomal abnormalities describe changes in the normal number of chromosomes or structural problems within the chromosomes themselves. These abnormalities occur when an egg or sperm with an incorrect number of chromosomes, or a structurally faulty chromosome, unites with a normal egg or sperm during conception.
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Detailed information on chromosome abnormalities, including trisomies, monosomies, and genetic translocations
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Detailed information on chromosome abnormalities, including how a chromosome is inherited
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Detailed information on how chromosome abnormalities happen: meiosis, mitosis, maternal age, and environment
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Detailed information on the different types of chromosome abnormality
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Detailed information on mosaicism and the chance that a chromosome abnormality will occur again
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Detailed information on the difference between a single gene defect and a chromosome abnormality
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