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Chapter 27 Human Genetics

Chapter 27 Human Genetics. 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.

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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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