How the RhD factor is transmitted

in your practical, you read about Maria, a first-year college student. During her previous blood donation, Maria learned that she had an AB- blood type. Maria has since become pregnant with her first child and is concerned that she is carrying an RhD+ fetus. (2.25 marks) Part A. Explain to Maria how the RhD factor is transmitted and how the fetus probably received RhD+. (1.25 marks) Part B. Explain to her why there is no risk to her first child, but might be to her second child if she were to have one. (1 mark)