Chorionic Villi Sampling

Chorionic Villi Sampling - are not visible in the...

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Chorionic Villi Sampling Chorionic villi sampling is a procedure in which a small amount of the placenta is removed. It is normally done during the 10th to 12th week but it can be done as early as the 5th week of pregnancy. Karyotype analysis can be performed on these cells immediately after sampling. Although Chorionic villi sampling can be performed earlier in the pregnancy than amniocentesis, the risk of inducing a spontaneous abortion is 1 to 2% higher than the background rate. Karyotypes Karyotypes are prepared using cells from amniocentesis, chorionic villi sampling, or white blood cells. Cells are photographed while dividing. cells are normally stained so that banding patterns appear on the chromosomes. The bands make it easier to identify the chromosomes. Banding patterns
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Unformatted text preview: are not visible in the photograph below due to the staining technique. Pictures of the chromosomes are cut out and arranged in pairs according to size and banding patterns. Karyotypes can be used to determine if there is an abnormality in chromosome number or structure. Nondisjunction Nondisjunction occurs when chromosomes fail to "disjoin" during meiosis or mitosis. Meiosis Metaphase I Anaphase I Telophase I Prophase II Meiosis II and Mitosis The diagrams below show nondisjunction during mitosis in a hypothetical species with 2N=8 chromosomes. Metaphase Anaphase Telophase G 1 Interphase The probability of nondisjunction increases with age. It increases rapidly after age 35 years in women and after 55 years in men....
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

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Chorionic Villi Sampling - are not visible in the...

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