A human genetic disease usually caused by the presence of an extra chromosome 21; characterized by developmental delays and heart and other defects that are generally treatable or non-life-threatening.Group of answer choicesHuntington’s diseasehemophiliasickle-cell diseaseTay-Sachs diseaseDown syndromeDuchenne muscular dystrophyNext

Which of the following is a genetic disorder caused by the presence of an extra chromosome 21?

A human genetic disease caused by a sex-linked recessive allele and characterized by progressive weakening and a loss of muscle tissue.Group of answer choicesTay-Sachs diseaseDuchenne muscular dystrophyHuntington’s diseasesickle-cell diseaseDown syndromehemophiliaNext

What disorder is caused by the presence of an extra twenty-first chromosome, characterized bymoderate to severe mental retardation and often physical abnormalities.A) Tay-Sachs DiseaseB) StrokeC) SeizureD) Down SyndromeE) Epilepsy

A human genetic disease caused by a sex-linked recessive allele resulting in the absence of one or more blood-clotting proteins, and characterized by excessive bleeding following injury.Group of answer choicessickle-cell diseasehemophiliaDown syndromeTay-Sachs diseaseDuchenne muscular dystrophyHuntington’s diseaseNext

A human genetic disease caused by a dominant allele; characterized by uncontrollable body movements and degeneration of the nervous system; usually fatal 10 to 20 years after the onset of symptoms.Group of answer choicesTay-Sachs diseaseHuntington’s diseasesickle-cell diseasecystic fibrosis