1. An evolutionary biologist once hypothesized that if evolution has affected human social behavior,

1. An evolutionary
biologist once hypothesized that if evolution has affected human social behavior,
then a mothers brothers should take a particular interest in her children more
so than the fathers brothers, and perhaps even more so than the father himself.
Why did he hypothesize this? (As it turns out, there are many cultures in which
men do, in fact, direct parental care primarily to their sisters kids.)

2. In 1999, a mysterious
outbreak of human encephalitis occurred in the northeastern United States. The
cause was tentatively identified as St. Louis encephalitis virus. At the

1. An evolutionary
biologist once hypothesized that if evolution has affected human social behavior,
then a mothers brothers should take a particular interest in her children more
so than the fathers brothers, and perhaps even more so than the father himself.
Why did he hypothesize this? (As it turns out, there are many cultures in which
men do, in fact, direct parental care primarily to their sisters kids.)

2. In 1999, a mysterious
outbreak of human encephalitis occurred in the northeastern United States. The
cause was tentatively identified as St. Louis encephalitis virus. At the same
time, an unusual number of dead birds were noticed along the northeastern
Atlantic coast. Figure 14.36 shows genetic
relationships of three known encephalitis viruses (St. Louis, Japanese, and
West Nile) and several viruses iso- lated from the birds, from two human patients that
died, from one dead horse, and from mosquitoes. (Data compiled from Anderson et al. 1999 and Lanciotti et al.
1999.)

a. Were the birds, the horse, and the humans all suffering from
the same disease?

b. Do you think the outbreak was caused by St. Louis encephalitis
virus?

c. Does this cladogram suggest how the disease might be spread?

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