SOLVED

71) Estimates of prevalence of Klinefelter’s syndrome range from 1 in ________ males. A) 500 to 1000 B) 2000 to 3000 C) 5000 to 10 000 D) 15 000 to 25 000 72) Denzel never developed appropriate male secondary sexual characteristics. Fellow male classmates often tease him because of his enlarged breasts and his poor muscular coordination. He also has mild mental retardation and is infertile. Denzel is most likely suffering from ________. A) Klinefelter’s syndrome B) Turner’s syndrome C) phenylketonuria D) Tay-Sachs disease 73) Turner’s syndrome involves the ________. A) X sex chromosome in males B) X sex chromosome in females C) Y sex chromosome in males D) Y sex chromosome in females 74) Judith is shorter than average. She has mild mental retardation, with her greatest difficulties being in math and science. Although her external genital development is normal, her ovaries are poorly developed and she is infertile. She is suffering from ________. A) Klinefelter’s syndrome B) Turner’s syndrome C) fragile X syndrome D) Tay-Sachs disease 75) The most common type of inherited mental retardation is ________. A) Klinefelter’s syndrome B) Turner’s syndrome C) fragile X syndrome D) Korsakoff’s syndrome 76) The second leading cause of mental retardation is ________. A) Klinefelter’s syndrome B) Turner’s syndrome C) fragile X syndrome D) Down syndrome 77) Fragile X syndrome causes mental retardation in 1 of every ________ males. A) 100 to 200 B) 1000 to 1500 C) 500 to 2000 D) 2000 to 2500 78) Fragile X syndrome is caused by ________. A) an extra chromosome B) a mutated gene C) a dominant gene D) a recessive gene 79) Fragile X syndrome causes mental handicaps in 1 of every ________ females. A) 500 to 1000 B) 1000 to 1500 C) 1500 to 2000 D) 2000 to 2500 80) Which of the following is NOT true of fragile X syndrome? A) The mutation always manifests itself. B) There is no treatment for fragile X syndrome. C) The disorder has more profound effects on males than on females. D) A genetic test can detect the disorder by direct DNA analysis.