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After Reading the Paragraphs Below, Answer the Question(s) That Follow(s)

Question 6

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After reading the paragraphs below, answer the question(s) that follow(s) .
Mr. and Mrs. Smith have three sons in elementary school. Two of their children are progressing normally, but their last son, Charles, has been much slower than his siblings at developing speech and language skills. His parents are concerned that he has a learning disability and decide to investigate further. Since some learning disabilities can be genetically based, their pediatrician recommends a chromosomal analysis.
The results show that Charles has a trisomy of the sex chromosomes, diagnosed as XYY, which is caused by nondisjunction in the formation of the father's sperm. The nondisjunction resulted in an extra copy of the Y chromosome. The extra copy was passed on to Charles during fertilization. Most often, this chromosomal change causes no unusual physical features or medical problems, but those with trisomy of the sex chromosomes do have a higher than normal risk of delays in learning development.
-An extra copy of the Y chromosome would be expected to cause problems because


A) more proteins encoded by the extra gene copies on the extra chromosome would be produced and create imbalances within cells.
B) the affected cells would die.
C) the child would become more aggressive.
D) the child would develop sexual ambiguity.

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