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Chapter 27 Human Genetics

Explore the fascinating world of human genetics with a focus on chromosomes. Learn about the 46 chromosomes in body cells, 23 in sex cells, and the role of autosomes and sex chromosomes. Discover how amniocentesis helps examine fetal chromosomes and delve into the complexity of karyotyping.

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Chapter 27 Human Genetics

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  1. Chapter 27 Human Genetics

  2. Chapter 27.1 Notes 3 things about chromosomes • Humans have 46 chromosomes in all body cells. • Humans have 23 chromosomes in all sex cells (sperm or egg). • Different organisms have different #’s of chromosomes.

  3. Amniocentesis is a way of looking at the chromosomes of a fetus. • 23rd pair of chromosomes determine sex (male/female) they are called sex chromosomes. Female= XX and Male= XY • Autosomes are chromosomes that do NOT determine sex (1-22nd pairs)

  4. Amniocentesis Human Karyotype Autosomes pairs 1-22 Sex cells the last pair (23)

  5. Work Cited • “amniocentesis”. April 30, 2007. http://health.yahoo.com/media/mayoclinic/images/image_popup/pr7_amnio.jpg • “Karyotype”. April 30, 2007. http://www.laskerfoundation.org/rprimers/gnn/wagn/images/karyotype.gif • “Purple Karyotype”. April 30, 2007. http://fairmanstudios.com/images/human_genetics.jpg

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