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24 terms

Exam 3

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During a dihybrid cros involving two linked genes, 18% of the resulting gametes showed a recombinant genotype. These two linked genes are _____ map units apart.
18
A Barr body is an example of
facultative heterochromatin
Genes that are located on the same chromosome are
linked
The C value is the amount of DNA in a
haploid genome
Antiparallel means that
the two polynucleotide chains run in opposite directions
The chromosome of most prokaryotes differs from those of eukaryotes because
the prokaryotic chromosome is circular, while the eukaryotic is linear
One genetic map unit is equal to a recombination frequency of
1 percent
Which enzyme elongates the new DNA strand starting at an RNA primer?
DNA polymerase III
The genetic material of a virus may be
single stranded RNA, double stranded DNA, double stranded RNA, single stranded DNA
Complementary base-pairing allows for
DNA to serve as its own template for replication
Genes that are linked
do not assort independently during meiosis
After a region of DNA has been replicated, ________ removes the RNA primers
DNA polymerase I
How many replication forks are produced when DNA denatures at an origin?
2
How many phenotypic classes may be generated from a three-point testcross?
2^3 = 8
As helicase unwinds the DNA molecule, what keeps the strands apart?
single-strand binding proteins
Which enzyme activity is associated with DNA polymerase I?
5' to 3' exonuclease, 5' to 3' polymerase, 3' to 5; exonuclease
A chromosome contains alleles for blue eyes and blonde hair. After meiosis the same chromosome contains alleles for blue eyes and brown hair. This occurred because of
crossing over
A human cell containing two sets of 23 chromosomes is
diploid
In both prokaryotes and eukaryotes, DNA replication is
bidirectional and semiconservative
In eukaryotes, chromosomes are duplicated during which stage of the cell cycle?
S
Cultivated wheat is descended from three distinct species, each with a diploid set of 14 chromosomes. Thus it is
an allohexaploid with 42 chromosomes
During replication, the direction of synthesis of new DNA from the leading and lagging strands is
5' to 3' only
What kind of analysis allows you to visualize an individual's chromosomal makeup?
karyotype analysis
Nondisjunction of chromosomes may result in
the loss of a single chromosome, the loss of one homologous chromosome pair, the addition of a single chromosome, the addition of one homologous chromosome pair