Principles of Genetic Counseling
INTRODUCTION Print Section Listen Although there have been many attempts to define what it means to provide genetic counseling, the provision of genetic counseling is a process that needs to…
Hereditary Cancer Syndromes
INTRODUCTION Print Section Listen Case 1: A 25-year-old patient presents to you for an annual examination.Evaluation of her family history reveals that her paternal grandmother and a paternal aunt died…
Screening for Genetic Disorders in Pregnancy
INTRODUCTION Print Section Listen Case 1:A 25-year-old Caucasian (Northern European ancestry) G1 presents for her first prenatal visit at 10 weeks’ gestation.Her medical and family history is negative for any…
Gynecologic Disorders With a Genetic Causation
INTRODUCTION Print Section Listen Case 1: Ms. Kolthoff is a 27-year-old G0 P0, who was evaluated for accelerated growth and advanced bone age in high school. She is currently married…
Methods of Prenatal Diagnosis
INTRODUCTION Print Section Listen Case 1: A 35-year-old, gravida 1, presents for prenatal care at 8 weeks’ gestation. How do you counsel her regarding her risks for genetic conditions in…
Patterns of Inheritance
PRINCIPLES OF MENDELIAN INHERITANCE Print Section Listen Mendelian disorders result from a mutation at a single genetic locus. A locus may be present on an autosome or on a sex…
Preconception Counseling
INTRODUCTION Print Section Listen Case 1: Ms. Meckel is a 25-year-old whose first and only pregnancy ended in a full-term normally grown infant with a large skin-covered encephalocele. The infant…
Common Chromosomal Abnormalities
INTRODUCTION Print Section Listen Case 1: A 25-year-old patient presents to you for counseling. She underwent chorionic villus sampling and the chromosomal analysis revealed trisomy 21. How do you counsel…
Taking a Family History
INTRODUCTION Print Section Listen Case 1: A 30-year-old G3P2 presents for her new OB visit at 10 weeks’ gestation. She has had two full-term uncomplicated vaginal deliveries. Her second child,…
Organization and Structure of Human Chromosomes
INTRODUCTION Print Section Listen The human genome is comprised of nuclear DNA sequences, tightly packed into distinct subunits called chromosomes and hundreds to thousands of circular DNA molecules within the…
