Trisomy 18, also known as Edwards syndrome, occurs when there is a gene mutation in either the egg or the sperm at the time of conception. An egg and a sperm each carry 23...
Trisomy 13, also known as Patau syndrome, occurs at the moment of conception when a gene mutation occurs in either the egg or the sperm. An egg and a sperm each carry 23...
When an infant is born with arms or legs that are not completely formed or are missing the condition is called a limb reduction defect. More infants are born with upper limb...