Which of the following can be diagnosed by examining a karyotype of an individual's white blood cells?
(A) Sickle cell anemia
(B) Alzheimer disease
(C) Down syndrome
(D) Cystic fibrosis
(E) Duchenne muscular dystrophy
Ans: (C) Down syndrome
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What differentiates diagnostic techniques that employ phenotypic (culture-based) methods from those that employ molecular methods?
a. Phenotypic methods are highly sensitive and specific, while molecular methods are not. b. Phenotypic methods examine the growth behavior of a microorganism and the pro-teins, enzymes, or toxins produced, while molecular methods examine the genetic makeup. c. Phenotypic methods are quantitative while molecular methods are not. d. Phenotypic methods are not limited to de-tection of live organisms as are molecular methods.
Members of the ____ lizard genus are commonly used as model systems for studies of ecology and evolutionary
biology.
a. Ichthyostega b. Anolis c. Dunkleosteus d. Eusthenopteron e. Archaeopteryx
The difference between cystic fibrosis and migraine is that the
A) former is caused by various environmental factors. B) former can be traced to a single gene. C) former is caused by the absence of a chromosome. D) latter is a Mendelian trait.
Which of the following conditions would most likely lead to an apparently normal human female?
a. Turner syndrome b. Down syndrome c. cri-du-chat d. Triple-X syndrome e. Klinefelter syndrome