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  #1  
Old 04-22-2010
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Eye Child's Red Eye in Photographs!

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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Old 04-22-2010
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Rb protein long arm of chromosome 13 retinoblastoma
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Old 04-22-2010
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the child has retinoblastoma ,Rb gene suppressor mutation. so ans choice A is most likely correct
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Old 04-23-2010
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I agree! definitely A (13q of the Rb gene)
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Old 04-23-2010
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Smile Yes, it's Retinoblastoma

Yeah, You are all right
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Old 04-15-2011
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Quote:
Originally Posted by FreakingOut View Post
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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Old 04-15-2011
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Retinoblastoma = Deletion of long arm of Chromosome 13

I choose A
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