Neither. It is an extra whole number chromosome 21. So instead of 46 chromosomes, a person with Down Syndrome will have 47.
http://wiki.answers.com/Q/Is_Down_syndrome_dominant_or_...
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However, some genetic disorders—such as Down syndrome, characterized by heart malformation, poor muscle tone, and a flattened face—result from a spontaneous mutation (gene change) that takes place during ... Sex-linked genetic disorders (XLGDs) can be either dominant or recessive. Dominant XLGDs affect females,
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www.scienceclarified.com/Ga-He/Genetic-Disorders.html
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Genes in each pair carry instructions for either dominant or recessive traits. Sometimes the genes are altered in some way, and a medical disorder results. ... Marfan syndrome, which affects connective tissue (connective tissue supports and connects structures of the body; tendons, ligaments, cartilage and bone are examples...
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www.marchofdimes.com/pnhec/4439_4136.asp
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Downs syndrome is neither dominant nor recessive. Nor has medical science been able to provide definitive answers as to what causes it.. It is commonly referred to as Trisomy 21 or Non-disjunction of the 21st chormosome. Downs is a chormoso...
http://www.faq4me.net/Homework_Help/1573831.htm
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it is an autosomal mutation of the dominant variety
http://answers.yahoo.com/question/index?qid=20080304140...
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Dear Dr. Universe, I am doing a biology project on Down Syndrome and I can not find if it is a dominant or recessive trait, is it sex-linked and what is the prevention? ;
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druniverse.wsu.edu/QandA.asp?questionID=22948
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Dominant Gene Disorders ... Recessive Gene Disorders ... This alternative to an amniocentesis removes some of the chorionic villi and tests them for chromosomal abnormalities, such as Down syndrome. Its advantage over an amniocentesis is that it can be performed earlier, allowing more time for expectant parents to...
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kidshealth.org/parent/system/medical/prenatal_tests.htm...
kidshealth.org/parent/system/medical/prenatal_tests.html
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2. Obtain pea seeds bred for dominant and recessive factors from a biological supply house. ... In recent years, scientists have found the genetic basis for Down syndrome. This unfortunate condition results from an extra twenty-first chromosome in all of the body cells, resulting from nondisjunction during meiosis,
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www.yale.edu/ynhti/curriculum/units/1982/7/82.07.06.x.h...
www.yale.edu/ynhti/curriculum/units/1982/7/82.07.06.x.html
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XYY syndrome ... Klinefelter syndrome (XXY) ... Turner syndrome (XO)
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www.rci.rutgers.edu/~jhudson/tsld004.htm
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