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Chapter 27 Human Genetics

Chapter 27 Human Genetics. 27.1 Role of Chromosomes 27.2 Human Traits 27. 3 Genetic Disorders. 27.1 Role of Chromosomes. Chromosome number How to tell the chromosome number Sex Determination. Human Chromosomes. Each sperm or egg has 23 chromosomes

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Chapter 27 Human Genetics

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  1. Chapter 27 Human Genetics 27.1 Role of Chromosomes 27.2 Human Traits 27. 3 Genetic Disorders

  2. 27.1 Role of Chromosomes • Chromosome number • How to tell the chromosome number • Sex Determination

  3. Human Chromosomes • Each sperm or egg has 23 chromosomes • Each body cell has 23 pairs or 46 chromosomes • Different organisms have different numbers of chromosomes

  4. Chromosome Numbers

  5. Amniocentesis

  6. Amniocenteses • Dr.’s analyze the amniotic fluid of an unborn baby • Able to count the number of chromosomes • Look for genetic disorders http://www.muschealth.com/animations/interactivebody.htm

  7. Karyotype • Complete set of all chromosomes of a cell of an organism • Arranged and displayed : in pairs, ordered by size.

  8. Determining Sex • Determined by male sperm • Female eggs carry only X chromosomes • Male sperm can be X or Y • Genotype Male: XY • Genotype Female: XX

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