The inheritance of blood types in humans can be explained by
a) linked genes.
b) simple dominance.
c) multiple alleles.
d) simple Mendelian genetics (one gene pair).
e) polygenic inheritance.
Ans: c) multiple alleles.
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Mitochondrial DNA sequences are useful to track recent evolution because
A) it mutates faster than nuclear DNA. B) it encodes more ancient proteins than does nuclear DNA. C) it is more stable than nuclear DNA. D) it is inherited from mothers only.
If you were to design a long-term research study to determine why there are no human births in Lapland during the months of August, September, and October, you would need to also examine a comparison population of humans in which births took place every month. The primary reason for including a comparison population within the design of this experiment would be to:
A. accumulate more facts that could be reported to other scientists. B. test the effects of more than one variable at the same time. C. prove that there are no births in Lapland during August, September, and October. D. act as a control that would ensure that the results obtained are due to a difference in only one variable.
The Human Genome Project seeks to
a. identify the nucleotide sequence of all human genes. b. develop a complete DNA library for a human gene. c. develop genetic markers for all genetic diseases. d. catalog all the varieties of human alleles. e. identify all humans that possess genetic defects.
Among the natural defenses present in tears is the protein lactoferrin. As you can infer from its name, it is also present in milk and other body secretions, and its function involves binding iron ions. The presence of lactoferrin in tears is protective against bacterial infection because
A. pathogens with magnetosomes will be segregated from the eye tissue and swept away by the tears. B. free iron serves as an immune signal to recruit T cells to the eye. C. in the presence of lysozyme, as found in tears, the proteins form a protective barrier on the lens. D. all pathogens must acquire iron from their environment and lactoferrin ensures that the iron concentration is low.