81. At birth, Debbie was given a mandatory screening test and tested positive for a disorder that required her to be placed immediately on a restricted diet to control her symptoms. Which of the following is mostly likely the condition for which she is being treated? a. sickle-cell anemia b. Huntington’s disease c. cystic fibrosis d. phenylketonuria 8 Which of the following disorders occurs only when the gene involved is inherited from the mother and not the father? a. Prader-Willi syndrome b. Angelman syndrome c. Fragile X syndrome d. Down syndrome 83. If a child has mutated genes on chromosome 15 contributed by the mother, he or she will be at risk for developing _____; if the mutated genes are from the father, he or she will be at risk for developing _____. a. Angelman syndrome; Prader-Willi syndrome b. Prader-Willi syndrome; Angelman syndrome c. Turner’s syndrome; Klinefelter’s syndrome d. Klinefelter’s syndrome; Turner’s syndrome 84. Rene has Down syndrome, which means that she has an extra chromosome on which chromosome pair? a. the 7th pair b. the 18th pair c. the 21st pair d. the 23rd pair 85. Which of the following genetic disorders is the result from a problem associated with the autosomes? a. Fragile X syndrome b. Turner’s syndrome c. Klinefelter’s syndrome d. Down syndrome 86. Down syndrome has been shown to be related to which of the following? a. father’s age b. mother’s age c. parents’ ethnic background d. mother’s diet during pregnancy 87. George’s younger brother is diagnosed at birth with “trisomy-21.â€Â Another term for this condition is: a. Klinefelter’s syndrome b. Supermale syndrome c. Fragile X syndrome d. Down syndrome 88. Suppose researchers identify a genetic disorder that has negative consequences if the gene is inherited from the mother, but no consequences at all if it is inherited from the father. According to the text, this situation would be: a. impossible b. an example of gene imprinting c. an example of a sex-linked trait d. an example of an autosomal disorder 89. Although most of an individual’s DNA is contained in the cell nucleus, some is also contained in the: a. ribosomes b. mitochondria c. endoplasmic reticulum d. cell membrane 90. What percent of mitochondrial DNA is inherited from the mother: a. it varies from individual to individual b. 100% of the child is female; 50% is the child is male c. 100% if the child is male; 50% if the child is female d. 100% for both male and female children