What does "mosaic trisomy 21" mean?
A) All of the cells in the body have the extra chromosome 21.
B) Most, but not all, of the cells in the body have the extra chromosome 21.
C) Only some of the cells in the body have the extra chromosome 21.
D) Only an end portion of the extra chromosome 21 is present and is attached to another chromosome.
Correct Answer:
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