BSC 120 Chapter 15 Review Practice Test Correctly Answered.
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BSC.
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BSC.
BSC 120 Chapter 15 Review Practice Test Correctly Answered.
Random orientation of homologous chromosomes occurs in __________ of meiosis. - CORRECT ANSWER metaphase I
metaphase II
prophase II
anaphase I
prophase I
Consider a cell that has four pairs of chromosomes. How many orientations...
BSC 120 Chapter 15 Review Practice
Test Correctly Answered.
Random orientation of homologous chromosomes occurs in __________ of meiosis. - CORRECT ANSWER
metaphase I
metaphase II
prophase II
anaphase I
prophase I
Consider a cell that has four pairs of chromosomes. How many orientations of all chromosomes are
possible during meiosis I in that cell? - CORRECT ANSWER 32
16
8
24
4
Consider a cell that has three pairs of chromosomes. What fraction of the gametes produced from this
cell will contain only maternal chromosomes? - CORRECT ANSWER 1/12
1/8
1/4
1/2
1/6
Random orientation of chromosomes during meiosis increases the amount of variation in the next
generation. What other process during meiosis leads to an increase in variation in the next generation? -
CORRECT ANSWER Two distinct phases, meiosis I and meiosis II.
Attachment of the spindle fibers to homologous chromosomes.
Crossing over between homologous chromosomes.
,All of these lead to increased variation in the next generation.
The formation of 4 haploid daughter cells.
Consider a cell that has a diploid chromosome number of 10 (2n=10). How many possible genetically
distinct gametes can this cell produce? - CORRECT ANSWER 100
32
1024
16
10
Which of the following causes an extra copy of a chromosomal region to occur? - CORRECT ANSWER 100
32
1024
16
10
When a chromosome is broken in two pieces and reconnected so that a region is flipped from the
normal order, this is called... - CORRECT ANSWER inversion
duplication
reciprocal translocation
deletion
simple translocation
Which of the following occurs when a piece of one chromosome breaks off and is attached to another
chromosome? - CORRECT ANSWER inversion
duplication
deletion
reciprocal translocation
simple translocation
, Which type of chromosomal mutation will usually have the MOST detrimental effect on organsimal
function and why? - CORRECT ANSWER An inversion, because genes will run in the 3' to 5' direction
instead of the 5' to 3' direction.
A duplication, because there will be twice as much protein produced for genes in the affected region.
A deletion, because there will be no protein product produced for genes in the affected region.
A reciprocal translocation, because two chromosomes are disrupted.
A simple translocation, because genes lie on a different chromosome than they should.
Part of a chromosome is duplicated. Why might this be a positive evolutionary force? - CORRECT
ANSWER Organisms that are able to survive chromosomal mutations, like duplications, must already be
highly fit.
If an organism make twice as much protein, it will be better suited to its environment.
Organisms with bigger genomes are better able to cope with environmental change.
If there are two genes, one is free to mutate and take on a different function.
It won't -- all mutations are detrimental to an organism.
In a translocation, the absolute amount and content of the genome remains the same. Why might some
translocations still make an organism inviable? - CORRECT ANSWER Translocations will cause some
segments of the chromosome to be deleted, so there will be no protein produced from genes in those
regions.
Translocations are mutations, and all translations are detrimental to an organism.
Translocations may cause problems during gamete formation when homologous chromosomes are
pairing.
Translocations may have break points in the middle of a gene, causing it to become nonfunctional.
Trasnlocations move genes to a chromosome that they are not supposed to be on.
A research lab is working with a particular species of insect that is known to be diploid with 14
chromosomes. While sorting through a colony of these insects, the researchers happen upon an unusual
phenotype in one particular individual. It is determined that this organism is aneuploid, with a total of
15 chromosomes. What number of chromosomes must have been present in the two gametes that
united to form the zygote? - CORRECT ANSWER Gamete 1 (normal):
___________ chromosomes
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