A genetic disorder has been studied through multiple generations using pedigree analysis. Every
person expressing the trait has an affected parent, and both sexes are equally affected. This suggests
what sort of trait and why? What will be an ideal response?
That both males and females are equally impacted suggests the trait is autosomal. That all those
expressing the trait suggest it is dominant. Thus, it is an autosomal dominant trait.
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Which of the following act as pain-signaling molecules?
a. substance P b. morphine c. endorphins d. histamine and prostaglandins e. dopamine
Heritability studies cannot provide information about the number, location, or identity of genes involved in specific
complex traits. a. True b. False
If both alleles of a particular gene are identical, the person is said to be
A) an identical twin. B) phenotypic. C) heterozygous. D) homozygous. E) genotypic.
In an experiment to test the effect of a new weight loss drug, half of the people in the study received the drug, and the other half received a placebo (a pill that has no physiological effect). In addition, only males from the ages of 20 to 25 were
selected to participate in the study. All participants received their treatments (drug or placebo) every day for 4 weeks. Which of the following components of the study design served as the control group? A) The 4-week length of the experiment. B) The restriction of study participants in age and gender. C) The participants who received a placebo. D) The participants who received the drug.