1. General 2. Forms of Birth Defects 3.The cause of birth defects 4. When a baby most vulnerable 5. How detected in advance 6. Spina Bifida 7. Congenital heart defects
1. chromatin 2.Chomosome 3. Sex chromosome and sex-determination 4. chromosomal polymorphism 5. An International System for Human Cytogenetic Nomenclature