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Post-Test
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1
Which of the following is not true of homologous chromosomes?
A)They may contain alleles of a particular gene.
B)They have the same location of the centromere.
C)They often are of different sizes.
D)They have identical banding patterns upon staining.
E)One homologue of the pair was contributed by the mother and the other homologue was contributed by the father.
2
The haploid number of chromosomes is found in all cells of the ovaries in females and testes in males.
A)True.
B)False.
3
If a parent cell of a sexually-reproducing species has 28 chromosomes, the number of chromosomes in the zygote would be
A)14.
B)28.
C)56.
D)112.
E)impossible to determine with the information given.
4
At the metaphase plate of meiosis I, one would not observe
A)tetrads.
B)dyads.
C)paired chromosomes.
D)chromatids.
E)a nuclear envelope.
5
If a parent cell has 30 chromosomes, at the end of telophase I there would be two cells, each with 15 chromosomes.
A)True.
B)False.
6
Gametes contain the haploid number of chromosomes because
A)crossing over occurs during prophase I.
B)homologous chromosomes pair at metaphase II.
C)chromatids separate at metaphase II.
D)homologues separate at meiosis I.
E)reduction of chromosome number is necessary during mitosis.
7
Crossing over occurs between
A)nonsister chromatids of a tetrad.
B)sister chromatids of the same chromosome.
C)nonhomologous chromosomes.
D)dyads.
E)centromeres of homologues.
8
Crossing over can occur during either metaphase I or metaphase II.
A)True.
B)False.
9
During which phase of meiosis I do sister chromatids separate?
A)Prophase
B)Metaphase
C)Anaphase
D)Telophase
E)Chromatids do not separate during meiosis I.
10
Interkinesis is characterized by a rapid synthesis of DNA.
A)True.
B)False.
11
The end product of _____________ is _____________.
A)anaphase I; two diploid cells
B)telophase I; a tetrad
C)telophase II; four haploid cells
D)prophase II; two diploid cells
E)metaphase II; daughter chromosomes
12
Which of the following is not true regarding meiosis and mitosis?
A)Meiosis results in four daughter cells.
B)The products of meiosis are genetically dissimilar to each other.
C)Mitosis occurs in all tissues.
D)Both require two nuclear divisions.
E)Following mitosis, the daughter cells have the same number of chromosomes as the parent cell.
13
The events of meiosis II are identical to mitosis.
A)True.
B)False.
14
Down syndrome is caused by
A)failure of DNA to replicate during the S stage of interphase.
B)nondisjunction.
C)an absence of a chromosome in the gametes.
D)overproduction of the cleavage furrow at cytokinesis.
E)failure of a cell to complete meiosis II.
15
A Barr body is
A)an inactivated X chromosome in female cells.
B)a region on the Y chromosome which determines maleness.
C)found only in the nucleus of plant cells.
D)responsible for Klinefelter syndrome.
E)Responsible for poorly developed ovaries in the female.
16
A person with __________ is an (XO) female, with 45 chromosomes.
A)Kleinfelter Syndrome
B)Down Syndrome
C)Turner Syndrome
D)Barr Body Syndrome
E)Swyer Syndrome
17
A typical human male has which of the following sex chromosomes?
A)XX
B)XY
C)XYY
D)XXY
E)XO
18
Autosomes include ____________.
A)sperm and eggs
B)the X and Y chromosomes
C)all the pairs of chromosomes
D)all the pairs of chromosomes, except the X and Y chromosomes
E)the gametes
19
A(n) ________ is the result of sperm and egg joining during fertilization.
A)oogenesis
B)chromosome
C)zygote
D)autosome
E)meiosis
20
One type of chromosome present in three copies is called ______?
A)diploidy
B)a tetrad
C)a dyad
D)trisomy
E)a Barr body







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