A child has been diagnosed as having a genetic disorder based on a mosaic trisomy. The nurse recognizes that the mother understands the significance of this diagnosis when she states:

Question

1. "Because my child has a mosaic trisomy, he will have some normal cells in his body, which means his disorder may not be as severe as in other children."
2. "Children born with mosaic trisomy do not pass the disorder on to their children."
3. "Mosaic trisomies are inherited from the father's side of the family."
4. "Mosaic trisomies occur in an ovum from an older woman."

Answer 1

1
Rationale 1: A child with a mosaic trisomy has some cells containing 46 chromosomes and other cells containing 47 chromosomes. The degree the child will be affected by the disorder is based on the percentage of body cells that contain the 47 chromosomes.
Rationale 2: Mosaic trisomy may be passed on to future generations.
Rationale 3: Mosaic trisomies occur after fertilization of the ovum and involve an error in chromosomal division early in embryonic development.
Rationale 4: This statement is incorrect. Mosaic trisomies occur in early embryonic life.
Global Rationale: