“In aneuploidy, a cell has three copies of a particular chromosome (resulting in 47 total chromosomes) or one copy of a particular chromosome (resulting in 45 chromosomes). An extra copy of a chromosome is called a trisomy; a missing copy is called a monosomy.

Any change in the number of chromosomes in the sperm or egg cell can affect the outcome of a pregnancy. Some aneuploidies can result in a live birth, but others are lethal in the first trimester and can never lead to a viable baby.” [Source]

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