When describing Down syndrome, it's important to note that

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When describing Down syndrome, it's important to note that

a. it can be classified as a single-gene disorder
b. it is caused when red blood cells cannot properly form hemoglobin
c. it causes infected males to have low testosterone levels
d. it is usually caused by three copies of chromosome 21

When describing Down syndrome, it's important to note that
Answer:

D. It is usually caused by three copies of chromosome 21
You usually hear the word chromosome when it comes to down syndrome. That is how it is caused



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