Fragile-X syndrome usually occurs as a result of Group of answer choices maternal age. unusually high codon repeats on the X chromosome. the inability to metabolize phenylalanine. paternal age.
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Fragile X syndrome is usually caused by a a trinucleotide repeat expansion in the 5' untranslated region of the FMR1 gene. a trinucleotide repeat expansion in the 3' untranslated region of the FMR1 gene. a trinucleotide repeat expansion in the coding region of the FMR1 gene. an imprinted gene on the paternal chromosome 15. mutation in the mitochondrial genome.
Adi S.
c. nondisjunction in a paternal meiocyte at meiosis I. d. nondisjunction in a paternal meiocyte at meiosis II. e. unequal crossing over. Fragile X syndrome is caused by a. exposure to high doses of 5-bromouracil. b. exposure to high doses of free radicals. c. an inherited microdeletion. d. spontaneous depurination. e. trinucleotide expansion.
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Sri K.
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