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A 4-month-old female is brought to her pediatrician by her mother who is concerned about some photographs she recently had developed. In the photographs, only the child’s right eye demonstrates a red reflex. Examination of the left eye confirms absence of a red reflex. Which of the following mechanisms is most likely involved?

A. Deletion in the long arm of chromosome 13
B. Deletion in the short arm of chromosome 5
C. Deletion of the short arm of chromosome 11
D. Nondisjunction of chromosome 18
E. Nondisjunction of chromosome 21
 

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A 4-month-old female is brought to her pediatrician by her mother who is concerned about some photographs she recently had developed. In the photographs, only the child's right eye demonstrates a red reflex. Examination of the left eye confirms absence of a red reflex. Which of the following mechanisms is most likely involved?

A. Deletion in the long arm of chromosome 13
B. Deletion in the short arm of chromosome 5
C. Deletion of the short arm of chromosome 11
D. Nondisjunction of chromosome 18
E. Nondisjunction of chromosome 21
ans is A child has retinoblastoma which is due to Rb1 gene mutation on the chromosome 13
 
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