Hi Dianne,
In most cases, Trisomy 13 is not inherited but just something that happens by chance when the egg and sperm are being formed or join together.
However, some families have variations in how their chromosomes are arranged, which means they have a higher chance of passing on an extra chromosome, or part of an extra chromosome to their babies. This is called a balanced translocation in the parent, and if the bub has more or less than the average number of chromosomes, it is called 'unbalanced'.
hope that helps,
Kate





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