Chapter 27 human genetics
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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

Chapter 27 Human Genetics

27.1 Role of Chromosomes

27.2 Human Traits

27. 3 Genetic Disorders


27 1 role of chromosomes
27.1 Role of Chromosomes

  • Chromosome number

  • How to tell the chromosome number

  • Sex Determination


Human chromosomes
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




Amniocenteses
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


Karyotype
Karyotype

  • Complete set of all chromosomes of a cell of an organism

  • Arranged and displayed : in pairs, ordered by size.


Determining sex
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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