Chapter Quiz
1.  

Unless the chromosomes were stained to show band patterns, a karyotype would be least likely to show which of the following? (p. 236)

an extra chromosome
a large part of a chromosome duplicated
a missing chromosome
part of a chromosome turned around
the attachment of a large part of a chromosome to another chromosome


2.  

Which one, if any, of the following statements is FALSE? (p. 236)

Diploid cells can divide by mitosis.
Diploid cells can divide by meiosis.
Haploid cells can divide by mitosis.
Haploid cells can divide by meiosis.
All of the statements are true.


3.  

In a diploid set of chromosomes, one of each pair of homologous chromosomes is derived from the father (paternal), the other of each pair from the mother (maternal). If 2n = 8, what is the probability of obtaining a gamete in which all the chromosomes are paternal ones? (p. 236)

1/4
1/8
1/16
1/32
Cannot be determined from these data.


4.  

The sexual cycle of the multicellular alga Fucus involves ____________. (p. 239)

mitosis only
both mitosis and meiosis
both mitosis and fertilization
only meiosis and fertilization
mitosis, meiosis, and fertilization


5.  

The function(s) of meiosis is (are) to _____. (p. 237)

decrease the chromosome number to haploid
introduce genetic variability into the daughter cells
ensure that each daughter cell gets a single copy of each of the cell's chromosomes
produce two cells
All of the above except #4.


6.  

Nuclear division resulting in cells that contain half the parental chromosome number is _____. (p. 241)

cytokinesis
mitosis
meiosis
interphase
metaphase


7.  

What is the function of meiosis? (p. 237)

to make exact copies of the parent cell
to make one cell with twice the number of chromosomes as the parent pairs
to make four cells with the same chromosome number as the parent
to make cells with a haploid (half that of the parents) number of chromosomes
none of the above


8.  

Chromosomes of diploid organisms that are NOT involved in sex determination are called _____. (p. 236)

autosomes
indeterminant chromosomes
mitotic chromosomes
heterochromosomes
nucleosomes


9.  

The egg (ovum) of a rabbit contains 22 chromosomes. How many chromosomes are in the somatic (body) cells of a rabbit? (p. 236)

11
22
44
88
132


10.  

Rice gamete cells contain 12 chromosomes. How many chromosomes do rice diploid cells have? (p. 236)

3
6
12
24
48


11.  

What is the typical result when a diploid cell undergoes meiosis? (p. 239)

two diploid cells
two haploid cells
four diploid cells
four haploid cells
two haploid cells and two diploid cells


12.  

If a diploid animal has 20 chromosomes, its sperm has _____. (p. 236)

20 chromosomes.
10 chromosomes.
40 chromosomes.
5 chromosomes.
30 chromosomes.


13.  

In a cell containing 10 chromosomes, meiosis results in the formation of daughter cells containing __________ chromosomes. (p. 236)

5
10
20
40
0


14.  

A karyotype is _____. (p. 236)

the physical traits a person has
a means of determining a person's phenotype
all the possible gametes a person could produce
a photograph of all a person's chromosomes
a list of all the genes a person carries


15.  

Two chromosomes in a nucleus that carry genes for the same traits in the same loci, but specify different versions of the same traits, are called _____. (p. 236)

chromatic chromosomes
complementary chromosomes
differentiated chromosomes
homologous chromosomes
sister chromatids


16.  

How many pairs of autosomes do humans have? (p. 236)

23
22
2
1
It depends on the sex of the individual.


17.  

A karyotype is produced by _____. (p. 236)

observing the phenotype of an individual
analyzing the genotype of an individual
observing a unique combination of chromosomes found in a gamete
testing the blood type of an individual
organizing the homologous chromosomes of a cell in relation to their number, size, and type


18.  

Which one of the following is true about homologous chromosomes? (p. 236)

They are found in animal cells but not in plant cells.
They have genes for the same traits at the same loci.
They pair up in prophase II.
They are found in haploid cells.
They are found in the cells of human females but not in human males.


19.  

Humans have 46 chromosomes. That number of (human) chromosomes will be found in _____. (p. 240)

all cells in anaphase of mitosis
all the egg and sperm cells
all gamete-producing cells after meiosis I
all the interphase somatic cells
all the cells of the body


20.  

When we say that an organism is haploid, we mean that _____. (p. 236)

its cells each have one chromosome
it has one half of a chromosome
its cells each have one set of chromosomes
its cells each have two sets of chromosomes
none of the above


21.  

An autosome is _____. (p. 236)

a chromosome other than a sex chromosome
the location of a specific gene on a chromosome
a self-replicating gene
a chromosome containing gender-determining information
a highway to a German genetics clinic


22.  

The diploid phase of the human life cycle begins with _____. (p. 236)

mitosis
meiosis
fertilization
a chromosomal mutation
the first division of the zygote


23.  

Which one of the following is NOT a function of meiosis in humans? (p. 237)

production of eggs
production of sperm
decreasing the number of chromosomes.
multiplication of body cells
none of the above


24.  

Body (somatic) cells in humans contain __________ set(s) of chromosomes and are therefore termed __________. (p. 236)

one ... diploid
two ... haploid
one ... haploid
two ... diploid
three ... triploid


25.  

Nearly all life cycles have both haploid and diploid phases. Usually, the transition from haploid to diploid takes place _____. (p. 236)

during crossing over in meiosis
when DNA is replicated in the S phase of mitosis
when mitotic cytokinesis occurs
at fertilization, when gametes fuse
during gastrulation


26.  

Spores and gametes are different in that _____. (p. 239)

gametes never resemble spores morphologically
gametes are always haploid while spores are diploid
gametes can fuse to form a zygote, but spores can develop into independent organisms without first forming a zygote
some gametes are motile, but no spores can move independently
gametes are derived directly from sporophytes to form gametophytes


27.  

At the end of telophase I of meiosis and cytokinesis, there are _____. (p. 241)

four haploid cells
two diploid cells
four diploid cells
one haploid ovum and three polar bodies
two haploid cells


28.  

Synapsis occurs during _____. (p. 240)

anaphase I
prophase I
cytokinesis
prophase II
metaphase I


29.  

During anaphase II _____. (p. 241)

homologues separate and migrate toward opposite poles
sister chromatids separate and migrate toward opposite poles
nuclei re-form
chromosomes line up in one plane
the cell is haploid


30.  

During anaphase I _____. (p. 240)

homologues separate and migrate toward opposite poles
sister chromatids separate and migrate toward opposite poles
nuclei re-form
chromosomes line up in one plane
the cell is haploid


31.  

Cytokinesis is the _____. (p. 241)

exchange of homologous regions of nonsister chromatids
formation of tetrads
independent assortment of chromosomes
transfer of genetic material involving sex pili
division of one cell into two


32.  

Centrioles separate during _____. (p. 240)

cytokinesis
prophase I and prophase II
metaphase I and metaphase II
anaphase I and anaphase II
telophase I and telophase II


33.  

Crossing over occurs during _____. (p. 244)

cytokinesis
metaphase I
prophase II
metaphase II
prophase I


34.  

Regions of chromosomes where nonsister chromatids cross over are called _____. (p. 240)

inversions
homologues
kinetochores
chiasmata
tetrads


35.  

In humans, the haploid number of chromosomes is 23. Independent assortment has the possibility of producing _____ different gametes. (p. 244)

232
1 million
223
24
100,000


36.  

If the diploid number of chromosomes in a certain animal is 6 (2n = 6), there are three sets of 2 homologous chromosomes each, or three pairs. How do these three pairs align and separate in meiosis? (p. 243)

All members of each set move together.
All 12 chromatids move together.
Any 2 sister chromatids move together in meiosis II.
The first to move influences all the others.
They align and assort independently to form any of eight different combinations.


37.  

An organism has a haploid chromosome number n = 4. How many tetrads will form during meiosis? (p. 240)

2
3
4
8
16


38.  

Which event ocurs only during prophase I of the first meiotic division? (p. 240)

Chromosomes contain two chromatids attached to the same centromere.
Synapsis of homologous pairs occurs.
Nuclear membrane breaks down.
Replication of DNA takes place.
A spindle of microtubules forms.


39.  

In a male mammal, every cell that undergoes meiosis gives rise to __________ sperm. (p. 239)

one
two
four
no set number
zero


40.  

In a species in which 2n = 16, how many homologous pairs of chromosomes are present in each daughter cell at the end of meiosis I? (p. 239)

0
4
8
16
32


41.  

Which one of the following occurs in meiosis, but not mitosis? (p. 242)

The cells formed have the same combination of genes as found in the initial cell.
Homologous chromosomes separate.
The nuclear envelope disappears.
Sister chromatids undergo disjunction.
A spindle apparatus forms.


42.  

Mitosis and meiosis differ in several ways. Meiosis, but not mitosis, _____. (p. 242)

results in four (rather than two) daughter cells
introduces genetic variation among daughter cells
changes the chromosome number of the daughter cells
involves two bouts of cell division
is correctly described by all of these statements


43.  

Meiosis is more complicated than mitosis because it carries out more complicated functions. Meiosis must _____. (p. 242)

decrease the chromosome number to haploid
introduce genetic variation among the daughter cells
ensure that each daughter cell gets a complete set of chromosomes
undergo two rounds of cytokinesis
all of the above


44.  

Which one of the following occurs in meiosis, but not in mitosis? (p. 242)

formation of a spindle apparatus
synapsis of homologous chromosomes
chromosomes lining up singly at the equator
synapsis of homologous chromosomes and chromosomes lining up singly at the equator
all of these occur in both mitosis and meiosis


45.  

Why is crossing over important? (p. 244)

It holds bivalents together.
It ensures that homologous chromosomes pair.
It allows the exchange of genes between homologous chromosomes.
It prevents variation in gametes.
It is necessary for the attachment of chromosomes to the spindle.


46.  

Ignoring crossover, how many kinds of gametes can be produced by an organism with a diploid number of 8? (p. 244)

2
4
8
16
32


47.  

For a species with a haploid number of 5 chromosomes, how many combinations of chromosomes are possible in the gametes? (p. 244)

5
16
25
32
64


48.  

The major contribution of sex to evolution has been _____. (p. 235)

the reproduction of species
to provide a method that creates greater genetic variation
to provide a method permitting the inheritance of somatic mutations
to combine reproduction with hedonism
to prepare for the emergence of diploid terrestrial organisms


49.  

Crossing over does NOT _____. (p. 244)

provide genetic variation
occur in gamete-producing cells
occur in the prophase of mitosis
usually yield genetically different chromatids
provide a basis for genetic mapping

   



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