Multiple choice

All of the following karyotypes are found in spontaneous abortuses. Which of the following is least likely to be found in a live-born infant?

  1. 46,XY

  2. 45, X

  3. 47, XX,+21

  4. 47, XX,+16
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

47, XX,+16 is a chromosomal abnormality in which there are three copies of chromosome 16 rather than two. It is the most common chromosomal cause of miscarriage during the first trimester of pregnancy. It is impossible for an infant to take birth with an extra copy of this chromosome present in all cells.

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