Chromosomal conditions are usually caused by changes in the number or structure of the chromosomes, i.e., having additional or missing genetic material. Severe chromosome issues can cause miscarriage or inability to get pregnant. If a child with a chromosomal abnormality is born, he/she might have mental retardation and developmental problems. Women older than 35 are at higher risk of having pregnancies affected with chromosomal disorders. A genetic condition occurs when one of the person’s genes is not functioning properly. There are various types of genetic conditions. Hopeful couples who are at risk of having a pregnancy that’s affected with a genetic condition are good candidates for preimplantation genetic diagnosis (PGD).