Why do X-linked disorders affect males more often than females?
a. The disorders are lethal in female embryos so affected females are unseen
b. Females that carry the trait usually have one functional allele.
c. Carrier mothers pass the mutated allele to all their sons.
d. Affected fathers pass the X-linked recessive allele to all their sons.
b
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As part of their reproductive cycle, helminths produce egg and sperm cells. Both of these eukaryotic cell types have an outer surface composed of polysaccharides known as the ________.
A. microtubule B. cell wall C. glycocalyx D. cyst E. cell membrane
Augustus Waller invented a machine that measures ____
a. blood pressure when the ventricles are contracting b. blood pressure when the ventricles are relaxed c. cardiac output d. electrical activity of the brain e. electrical activity of the heart
Ecological pyramids can be upright or inverted, depending on the ecosystem. If the numbers pyramid is inverted, what information does this portray?
a. extinction event b. ecosystem recovering from catastrophe c. lower populations in producers than consumers d. excessive nutrients in the system
In the event that you are modeling weekly advertising spend (as a dependent variable), and you notice that several weeks have no spending-it is likely your analysis will have to handle what?
A. A selected sample problem B. A limited dependent variable C. An endogeneity problem D. A small sample problem