Answer to Question 1
Norovirus illustrates the importance of personal hygiene. Norovirus is passed in the stool and vomit of infected people. Thus, infected people who do not wash their hands adequately can pass the virus directly to other people, or they can pass it indirectly by way of contaminated food or water. Outbreaks in the United States are often linked to food touched by infected food handlers or to person-to-person contact in day care centers, in nursing homes, and on cruise ships. People can also be infected with norovirus by eating raw shellfish such as oysters and clams that are grown in sewage-contaminated waters.
Answer to Question 2
d
Red-Green Color Blindness Is a Sex-Linked Trait in Humans
Cross-sectional data showing that the amount of effort spent on personal health care increases with
IgE bound to a mast cell and cross-linked by antigen-causing mast cell degranulation.
Personal care setting.
Human X- Linked Traits
Morgan’s analysis of genetic linkage of X-linked genes for eye color