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

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

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

An anomaly in which there is one extra, or one fewer chromosome than normal is called: A) Trisomy B) Monosomy C) Aneuploidy D) Karyotype E) Translocation

Which of the following diseases is NOT a consequence of improper chromosome segregation? Alzheimer’s disease Down’s syndrome Turner’s syndrome None of the above

Which of the following has 22 + X chromosomes in its nucleus?