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If a dominant and a recessive gene appear together (the heterozygous condition), the dominant will always win, producing the trait it is coded for. The only time a recessive trait (such as the one for blond hair) expresses itself is when two recessive genes are present (the homozygous condition).
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science.jrank.org/pages/2988/Genetics-Dominant-recessiv...
science.jrank.org/pages/2988/Genetics-Dominant-recessive-traits.html
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2. Each hereditary trait is produced by two factors (genes), one from each parent. ... 3. Hereditary factors are of two types: dominant and recessive. ... 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,
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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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C. Define and illustrate co-dominance, dominant, recessive, ... A trait that is transmitted as autosomal recessive is expressed only in persons who have the gene in a homozygous state; i.e. ... Down syndrome can usually be diagnosed at birth or shortly thereafter by its phenotypic features. The eyes may be close set with narrow...
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www.yale.edu/ynhti/curriculum/units/1982/7/82.07.04.x.h...
www.yale.edu/ynhti/curriculum/units/1982/7/82.07.04.x.html
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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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XYY syndrome ... Klinefelter syndrome (XXY) ... Turner syndrome (XO)
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www.rci.rutgers.edu/~jhudson/tsld004.htm
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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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He either has the trait or he does not--he cannot be a carrier. An allele on an X chromosome in a female may or may not be expressed, depending upon whether it is dominant or recessive and on the nature of the allele on the second X chromosome. ... Down syndrome and its karyotype. An extra chromosome 21.
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www.life.uiuc.edu/bio100/lectures/fall97lects/12f97chro...
www.life.uiuc.edu/bio100/lectures/fall97lects/12f97chromo.html
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However, some genetic disorders—such as Down syndrome, characterized by heart malformation, ... Dominant trait: A trait that can manifest (be expressed) when inherited from one parent. ... Recessive trait: A trait that is expressed in offspring only when identical genes for the trait are inherited from both parents.
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www.scienceclarified.com/Ga-He/Genetic-Disorders.html
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Down syndrome (also called trisomy 21) is a chromosomal disorder caused by the presence of all or part of an extra 21st chromosome. Since it is cause by having a *third* set of certain genes, it is not dominant or recessive in the usual sen...
http://answers.yahoo.com/question/index?qid=20080601004...
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