Biology 251 - Genetics » Spring 2021 » Exam 2

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Question #1
Termination of replication in eukaryotes is accomplished by replication forks meeting or movement of the replication forks to the eneds of the chromsomes.
A.   False
B.   True
Question #2
E. coli has a single replicon spanning the 4,600,000 bp of its genome, while eukaryotes have multiple replicons on each chromosome.
A.   True
B.   False
Question #3
A Mendelian ratio of 2:1 is observed when a mutant allele shows the phenomenon of:
A.   recessive epistasis.
B.   incomplete penetrance.
C.   codominance.
D.   recessive lethal.
E.   incomplete dominance.
Question #4
If a woman with blood type A has a child with a man of blood type B, which of the following blood types would not be possible considering all of the genotypes that determine these blood types?
A.   O would not be possible
B.   B would not be possible
C.   All types are possible
D.   AB would not be possible
E.   A would not be possible
Question #5
In the gene interaction phenomenon, a single characteristic is controlled by alleles from two different genes, giving a 9:3:3:1 phenotypic ratio in the F2 generation of a dihybrid cross.
A.   True
B.   False
Question #6
The phenotype dictated by a particular genotype might not show itself in an individual due to the environment in which the organism underwent development.
A.   True
B.   False
Question #7
The degree to which a character is expressed in a mutant individual is termed penetrance.
A.   True
B.   False
Question #8
All genomes found in nature use double-stranded DNA to store their genetic information.
A.   True
B.   False
Question #9
During replication in both bacteria and eukaryotes, the origins of replication create two forks that travel in a replication bubble bidirectionally, with a leading and lagging strand for each fork.
A.   True
B.   False
Question #10
DNA evolved as the genetic material since RNA is less stable than DNA primarily because it contains uracil instead of thymine.
A.   False
B.   True

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