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Chromosomal Disorders Nondisjunction
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Down Syndrome Life Expectancy 55 yrs
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Frequency of Down Average 1:700 Births
/1400 /1100 /900 /100 /25
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Edward’s Syndrome Trisomy 18
1:6,000 Births Second most common after Down Syndrome
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Patau Syndrome Trisomy 13
1:12,000 Births > 80% die in first year
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1:50,000
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Turner Syndrome 45,X 1:2,500 Births
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Klinefelter Syndrome 47, XXY
tall, longer arms than legs 1: :1000 no or low testosterone male reproductive organs under developed no sperm production develop some breast tissue
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47, XYY Super Male
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Triple X 47, XXX Skin folds that descend and cover the inner corners of the eyes Wide spacing between the eyes Decreased muscle tone (hypotonia) Curved fifth ("pinky") fingers Small head circumference Learning disabilities, such as delayed speech and language development, and difficulty reading Delayed motor skills, such as sitting and walking Problems processing sound Behavioral and emotional problems, including attention deficit hyperactivity disorder (ADHD), anxiety, and depression Premature ovarian failure or ovary malformations (though infertility is rare) Menstrual irregularities
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