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

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

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

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

Chapter 27 Human Genetics

27.1 Role of Chromosomes

27.2 Human Traits

27. 3 Genetic Disorders

Page 2: 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

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

Human Chromosomes

1. Each sperm or egg has 23 chromosomes

2. Each body cell has 23 pairs or 46 chromosomes

3. Different organisms have different numbers of chromosomes

Page 4: Chapter 27 Human Genetics 27.1 Role of Chromosomes 27.2 Human Traits 27. 3 Genetic Disorders.

Chromosome Numbers

Organism # body chromosomes

# body cell chromosome

pairs

# sex cell chromosomes

Red Clover 12 6 6

Pea 14 7 7

Cat 38 19 19

Rabbit 44 22 22

Human 46 23 23

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Amniocentesis

Page 6: Chapter 27 Human Genetics 27.1 Role of Chromosomes 27.2 Human Traits 27. 3 Genetic Disorders.

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

http://www.muschealth.com/animations/interactivebody.htm
Page 7: Chapter 27 Human Genetics 27.1 Role of Chromosomes 27.2 Human Traits 27. 3 Genetic Disorders.

Karyotype

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

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

Page 8: Chapter 27 Human Genetics 27.1 Role of Chromosomes 27.2 Human Traits 27. 3 Genetic Disorders.
Page 9: Chapter 27 Human Genetics 27.1 Role of Chromosomes 27.2 Human Traits 27. 3 Genetic Disorders.

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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Section 27.2

Section 27.2

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