BIO 152: EXAM 2 WITH CORRECT
ANSWERS 2025
Based only on this tree, which of the living taxa is expected to be
most similar to the ancestor at node X?
**see quiz for picture
a) raccoon
b) sealion
c) sealion or seal
d) It cannot be determined. correct answers >> d) It cannot
be determined.
On a phylogenetic tree, where do character changes almost
always occur?
a) at the root
b) at the nodes
c) on the branches
d) at the tips
e) in the leaves correct answers >> c) on the branches
A population of 1000 mustard plants is polymorphic for the
glabrous locus, with 2 alleles affecting the presence/absence of
trichomes (hairs). If the number of individuals with each of the
, genotypes is as follows, what is the frequency of the dominant G
allele?
GG = 360 individuals; Gg = 240; gg = 400
a) 0.36
b) 0.48
c) 0.50
d) 0.60
e) 0.64 correct answers >> b) 0.48
The dominant lactose tolerance allele has a frequency of 80% in a
certain human population. Assuming that the population is in
Hardy-Weinberg equilibrium, what percent of individuals within
this population get a stomachache from drinking milk (i.e., are
lactose intolerant)?
a) 4%
b) 8%
c) 10%
d) 20%
e) 32% correct answers >> a) 4%
Walruses and seals are the only taxa on this tree that do not have
an external ear. What is the most parsimonious reconstruction of
external ear evolution?
**see quiz for picture
ANSWERS 2025
Based only on this tree, which of the living taxa is expected to be
most similar to the ancestor at node X?
**see quiz for picture
a) raccoon
b) sealion
c) sealion or seal
d) It cannot be determined. correct answers >> d) It cannot
be determined.
On a phylogenetic tree, where do character changes almost
always occur?
a) at the root
b) at the nodes
c) on the branches
d) at the tips
e) in the leaves correct answers >> c) on the branches
A population of 1000 mustard plants is polymorphic for the
glabrous locus, with 2 alleles affecting the presence/absence of
trichomes (hairs). If the number of individuals with each of the
, genotypes is as follows, what is the frequency of the dominant G
allele?
GG = 360 individuals; Gg = 240; gg = 400
a) 0.36
b) 0.48
c) 0.50
d) 0.60
e) 0.64 correct answers >> b) 0.48
The dominant lactose tolerance allele has a frequency of 80% in a
certain human population. Assuming that the population is in
Hardy-Weinberg equilibrium, what percent of individuals within
this population get a stomachache from drinking milk (i.e., are
lactose intolerant)?
a) 4%
b) 8%
c) 10%
d) 20%
e) 32% correct answers >> a) 4%
Walruses and seals are the only taxa on this tree that do not have
an external ear. What is the most parsimonious reconstruction of
external ear evolution?
**see quiz for picture
