Chapter 27 Human Genetics. Chapter 27.1 Notes 3 things about chromosomes 1.Humans have 46 chromosomes in all body cells. 2.Humans have 23 chromosomes.

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Presentation transcript:

Chapter 27 Human Genetics

Chapter 27.1 Notes 3 things about chromosomes 1.Humans have 46 chromosomes in all body cells. 2.Humans have 23 chromosomes in all sex cells (sperm or egg). 3.Different organisms have different #’s of chromosomes.

Amniocentesis is a way of looking at the chromosomes of a fetus. 23 rd 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 (1-22 nd pairs)

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

Work Cited “amniocentesis”. April 30, mages/image_popup/pr7_amnio.jpg mages/image_popup/pr7_amnio.jpg “Karyotype”. April 30, nn/wagn/images/karyotype.gif nn/wagn/images/karyotype.gif “Purple Karyotype”. April 30, genetics.jpg genetics.jpg

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