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61. About what percent of the DNA molecule is made up of protein-coding genes: a. about 2% b. about 25% c. about 60% d. nearly 100% 6 The part of the DNA molecule that does not function as genes, but that can influence how genes work is referred to as a. polygenetic forces b. recombinant processes c. epigenetic forces d. meta-genetic forces 63. Andre explains that early malnutrition – an environmental condition – actually may change the way that genes express themselves. In other words, starvation turns some genes “off” and others “on,” thereby influencing genetic processes. The central argument that Andre is making emphasizes the basic idea of: a. epigenetics b. polygenic inheritance c. incomplete dominance d. recombinant processes 64. What percent of babies born today in the United States are healthy and normal? a. 60% b. 73% c. 87% d. 97% 65. Anne mentions that her cousin has a congenital anomaly. You would know that this is sometimes also referred to as: a. a sex-linked trait b. a birth defect c. an autosomal disorder d. a heterozygous trait 66. Which of the following is NOT a sex-linked disorder? a. Down syndrome b. hemophilia c. Fragile X syndrome d. color blindness 67. Which of the following sex-linked disorders occurs most frequently? a. Klinefelter’s syndrome b. Turner’s syndrome c. hemophilia d. color blindness 68. Which of the following inherited disorders results in problems with blood clotting? a. Klinefelter’s syndrome b. Turner’s syndrome c. hemophilia d. color blindness 69. Which of the following syndromes occurs only in females? a. Down syndrome b. Turner’s syndrome c. Klinefelter’s syndrome d. Fragile X syndrome 70. Todd is mentally retarded, sterile, and has small external genitalia, undescended testicles, and breast enlargement. His chromosome pattern is XXY. Since puberty, he has received hormone replacement therapy in order to maintain his secondary-sex characteristics. What sex-linked abnormality does Todd most likely have? a. Klinefelter’s syndrome b. Down syndrome c. Turner’s syndrome d. Fragile X syndrome

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