EXAM #3 Version A
BSC 2010 – Fall 2007
PRACTICE EXAM 3
Read each question and all answers carefully before answering. Questions that you may have seen before
have probably been rewritten in significantly different ways. Choose the
answer for each. Work at a
steady pace, and you should have ample time to finish.
1) Which combination of the following species characteristics would cause the greatest likelihood of
fossilization in sedimentary rock?
I. The species was abundant.
II. The species was widespread.
III. The species had hard body parts.
IV. The species was adapted to desert life.
V. The species had a long duration in geologic time.
A) III and IV
B) I, II, and III
C) I, II, and V
D) I, II, III, and V
E) III only
2) The correct sequence from the most to the least comprehensive of the taxonomic levels listed here is
A) phylum, family, class, order, kingdom, genus, and species.
B) kingdom, phylum, class, order, family, genus, and species.
C) phylum, kingdom, order, class, species, family, and genus.
D) kingdom, phylum, family, class, order, genus, and species.
E) kingdom, phylum, order, class, family, genus, and species.
3) Which of the following is
true of vertically oriented phylogenetic trees?
A) The common ancestor represented by the highest branch point existed more recently in time than the
common ancestors represented at lower branch points.
B) Each branch point represents a point in absolute time.
C) The more branch points there are, the more instances of cladogenesis are represented.
D) Organisms represented at the base of such trees are ancestral to those represented at higher levels.
E) The more branch points that occur between two taxa, the more divergent their DNA sequences should
4) Shared primitive characters
What is the most important
evidence or observation in Darwin's theory of 1859?
A) evidence that some organisms became extinct
B) the source of genetic variation
C) observation that variation is common in populations
D) observation that competition exists in populations
E) evidence of the overproduction of offspring
The more rare a recessive allele, the more likely it is to be found in organisms that are:
E) C and D
Use the following information to answer the questions below.
A large population of laboratory animals has been allowed to breed randomly for a number of generations.
After several generations, 36% of the animals display a recessive trait (
), the same percentage as at the
beginning of the breeding program. The rest of the animals show the dominant phenotype, with
heterozygotes indistinguishable from the homozygous dominants.