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Karyotyping - PowerPoint PPT Presentation

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Karyotyping
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  1. Karyotyping

  2. Karyotyping • Organized into homologous pairs • Shows • Gender • Chromosome number

  3. Chorionic Villus Sampling Suction extracts cells from placenta Pro Can be done in first 9 weeks Con Slightly higher risk Amniocentesis Needle extracts cells from amniotic fluid Pro Low risk Con Must wait 14-16 weeks Acquisition of Cells

  4. Characteristics • Length • 1 > 22 • 7 > X > 8 • 22 > Y

  5. Characteristics • Banding • Result of stains • Homologs have same pattern

  6. Characteristics • Centromere Position • Central (middle) • 1, 3, 7, 9, 11, 16, 19, X • Terminal (near end) • 13, 14, 22, Y • Subterminal (between middle and end) • 2, 4, 5, 6, 8, 10, 12, 15, 17, 18, 20, 21

  7. Karyotype 1

  8. Karyotype 2

  9. Karyotype 3

  10. Karyotype 4

  11. If the diagnosis is normal or inviable, chose another disorder to discuss for the following sections. Consultation • Diagnosis • Explain what the problem is based on your karyotype • Symptoms • Let the parents know what they may encounter in caring for their child • References • Provide the parents with links and descriptions to websites where they can learn more