Typically, a human being has a total of 46 chromosomes in every cell of the body.
Chromosomes come in pairs.
Just as we inherit half of our chromosomes from each of our parents, we inherit half of our genes from our mother and half from our father. Amniocentesis allows us to examine the baby's chromosomes. An abnormality in the number or structure of the chromosomes results in the loss or gain of important genetic information. Our bodies are very sensitive to having the exact amount of genetic information required for development. In Families Chromosome abnormalities do not usually correlate with a condition that runs in families.