Lab 4 - INTRODUCTION TO PHYSICAL ANTHROPOLOGY ANT 102...

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INTRODUCTION TO PHYSICAL ANTHROPOLOGY ANT 102 Wednesday 11:00 Lab LAB #4: POPULATION GENETICS Due Date: 3/2/16 Madison Wescott 1
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Part 2 Down Syndrome occurs when a person has a full or partial extra copy of chromosome 21. It alters the way that a child develops and causes characteristics associated with Down Syndrome. Some common phenotypic expressions include: low muscle tone, small stature, upward slant of the eyes, and a single deep crease across the center of the palm. One in ever 691 babies in the US are born with DS. It is currently the most common genetic condition in the US. 6,000 babies are born in the US with DS each year. Males and females get DS equally. DS was not discovered until the late 19 th century. There are three different types of down syndrome. The first is trisomy 21 (nondisjunction). This is where the 21 st chromosomes in either the sperm or egg fails to separate, which causes the development of the extra chromosome. This accounts for 95% of DS cases. The second is Mosaicism, which is a mixture of two types of
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