A normal set of Human chromosomes contains twenty-three pairs. The 23rd set determines the sex of the person. In a male, the chromosomes are XY and in a female, they are XX. They are referred to as the XY chromosomes and the XX chromosomes instead of a number. The Y is significantly smaller than the X.
People sometimes think that having an extra chromosome or two would result in a superhuman. This is not the case. Extra chromosomes, damaged chromosomes and missing chromosomes almost always cause abnormalities. In rare cases these may be beneficial.
Studies of Chromosomes are made by enlarging photographs of an individual’s chromosomes. The Chromosomes are cut out of the picture and are matched in pairs and glued into place by an expert. This is called a Karyotype. You can see an example of this in your text book on page 69.
Purpose:
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Infants with this condition often have a high pitched cry that sounds like that of a cat. It causes intellectual disability, small head and weak muscles, distinctive features including widely set eyes, low set ears, a small jaw, and a rounded face.
Answer the following questions about your lab:
1. How could you determine if your karyotype was male or female?
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2. Why do you think that Chromosomes are of different sizes?
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3. How many Chromosomes are there in a human Karyotype?
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4. Choose a genetic condition above and explain how it would be represented in a karyotype.
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5. Did you notice any pattern in the arrangement of the Karyotype?
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6. Would you like to karyotype as a career?