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    Exam 2: Biological Foundations: Heredity, Prenatal Development, and Birth 
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    "Trisomy  21" (Three 21st Chromosomes)best Describes ​
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"Trisomy  21" (Three 21st Chromosomes)best Describes ​

Question 19

Question 19

Multiple Choice

"Trisomy  21" (three 21st chromosomes) best describes ​


A) Huntington's disease.
B) Down syndrome.
C) Phenylketonuria (PKU) .
D) sickle-cell trait.

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