Answer:
parents can check if the embryo has a disease
if it does, they can terminate the pregnancy
some of these are caused by a change in a single gene known as a single gene disorder
if one or both parents are carriers of a genetic disorder, they have a chance of passing it to their children even if they themselves are healthy.
Step-by-step explanation:
pre-implantation genetic diagnosis aka PGD
checks for diseases in embryos like
Cystic fibrosis.
Tay-Sachs disease.
Spinal muscular atrophy (SMA)
Hemophilia.
Sickle cell disease.
Duchennes muscular dystrophy.
Thalassemia
Down syndrome
some of these are caused a change in a single gene known as a single gene disorder
yourgenomeorg
learngeneticsutahedu