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Multiple Choice Quiz
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1

Which statement(s) is/are true about sexual reproduction?
A)It is a successful method of exchanging genetic information.
B)It involves shuffling of genetic information.
C)It requires that the chromosome number be reduced for the formation of the gametes.
D)All of the above.
2

A zygote has a(n) __________ number of chromosomes.
A)Haploid
B)Diploid
C)Triploid
D)Undetermined
3

The sex cells are called __________ and the process whereby they unite is called __________.
A)Gametes / fertilization
B)Gametes / gametogenesis
C)Egg and sperm / zygote facilitation
D)Egg and sperm / gametogenesis.
4

The term "homologous chromosomes" refers to
A)A single set of chromosomes - such as a haploid set.
B)A pair of chromosomes that contain similar or corresponding genes.
C)Chromosomes that are similar in a number of different species.
D)None of the above.
5

Which statement is true about analogous organs?
A)The ovary corresponds with the pistil; the testes corresponds with the anther.
B)The ovary corresponds with the anther; the testes corresponds with the pistil.
C)The ovary corresponds with both the pistil and the anther; the testes does not have a corresponding part.
D)The testes corresponds with both the pistil and the anther; the ovary does not have a corresponding part.
6

The knot-like structure holding the strands of DNA together is the
A)Chromatid.
B)Centromere.
C)Centrosome.
D)Chromomere.
7

The term "reduction division" means that
A)When the cell divides, the chromosomes undergo a series of reduction reactions.
B)When the cell divides, each daughter cell receives a reduced number of chromosomes.
C)The cell must undergo a series of reduction reactions before chromosomal division can occur.
D)All of the above.
8

Which statement is true?
A)The phases of meiosis I are clearly defined, but the phases of meiosis II are artificial constructs.
B)The phases of meiosis I are artificial constructs, but the phases of meiosis II are clearly defined.
C)Neither the phases of meiosis I nor the phases of meiosis II are clearly defined; both are artificial constructs.
D)Both the phases of meiosis I and the phases of meiosis II are clearly defined.
9

The process of separating homologous chromosomes and the genes they carry is called
A)Independent assortment.
B)Synapsis.
C)Segregation.
D)None of these.
10

Crossing-over is a characteristic of
A)Prophase I
B)Prophase II
C)Metaphase II
D)All of the above.
11

Anaphase II differs from anaphase I because during anaphase II
A)The spindle fibers are not present.
B)The centromere of each chromosome divides.
C)The daughter chromosomes use the "crossing over" technique.
D)All of the above.
12

As a general rule
A)After telophase II, there are four haploid cells.
B)The events of meiosis are essentially the same for both egg and sperm.
C)Meiosis is necessary to maintain the correct number of chromosomes in each cell.
D)All of the above.
13

Two genes are said to be linked if both
A)Code for the same trait.
B)Have the same biochemical backbone.
C)Are found on the same chromosome.
D)Must be present for either to function.
14

Nondisjunction occurs when
A)A chromosome does not migrate properly and becomes a part of the "wrong" daughter cell.
B)Crossing-over causes a breakage in the arm of the chromosome.
C)The rules of independent assortment do not apply.
D)The karyotype is determined.
15

Which statement(s) is/are true about Down syndrome?
A)The evidence supports the age of the mother's egg as a factor in the syndrome.
B)Either the egg or the sperm can contribute the gamete with the extra chromosome.
C)It used to be thought that a 14/21 chromosomal translocation was a cause of Down syndrome.
D)The gene for Down syndrome is located on an autosome rather than on a sex chromosome.
16

The exchange of genetic material (genes) between segments of homologous chromosomes results in
A)new gene combinations.
B)zygotes.
C)diploid cells.
D)segregation of genes.
17

A process that occurs during prophase I is
A)segregation.
B)synapsis.
C)reduction division .
D)independent assortment.
18

The diploid number of chromosomes is found in cells during:
A)prophase II.
B)telophase I .
C)anaphase II.
D)prophase I.
19

The fact that each homologous pair of chromosomes in humans separates and moves to the poles without being influenced by the other pairs is
A)segregation.
B)disintegration.
C)independent assortment.
D)fertilization.
20

A new nuclear membrane is formed in:
A)anaphase I.
B)prophase II.
C)telophase I.
D)anaphase II.
21

In mitosis the centromeres split during anaphase; and, in meiosis during:
A)anaphase I.
B)telophase I .
C)prophase II.
D)anaphase II .
22

Diploid cells are formed by:
A)synapsis.
B)reduction division.
C)fertilization .
D)independent assortment.
23

An organism having a diploid number of 12 forms gametes having:
A)6 chromosomes.
B)12 chromosomes .
C)18 chromosomes .
D)24 chromosomes.
24

Segregation of homologous chromosomes occurs during
A)mitosis.
B)meiosis I.
C)meiosis II.
D)all of the above.
25

A gamete can have too many or too few chromosomes when ___________ occurs.
A)nondisjunction.
B)crossing over.
C)synapsis.
D)independent assortment.
26

Variation among offspring in sexually reproducing organisms comes about by
A)crossing over.
B)fertilization.
C)independent assortment.
D)all of the above.
27

Gametogenesis produces
A)sex cells.
B)gonads.
C)zygotes.
D)testes.
28

Crossing over occurs between
A)sister chromatids.
B)homologous chromosomes.
C)gametes.
D)spindle fibers.
29

Which of the following represents chromosome number before and after the process of meiosis?
A)n --> n
B)n --> 2n
C)2n --> n
D)2n --> 2n





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