Question 1

Crossover,the exchange of segments of homologous chromosomes,takes place during which of the following processes?

Accepted Answer

A) prophase II 
B) metaphase I 
C) anaphase I 
D) synapsis 
A) prophase II 
B) metaphase I 
C) anaphase I 
D) synapsis

Question 2

What is a major difference between mitosis and meiosis I?

Accepted Answer

A) Sister chromatids separate in mitosis,and homologues separate in meiosis I. 
B) DNA replication takes place prior to mitosis,but not before meiosis I. 
C) Sister chromatids separate in mitosis,and homologues separate in meiosis II. 
D) Only meiosis I results in daughter cells that contain identical genetic information. 
A) Sister chromatids separate in mitosis,and homologues separate in meiosis I. 
B) DNA replication takes place prior to mitosis,but not before meiosis I. 
C) Sister chromatids separate in mitosis,and homologues separate in meiosis II. 
D) Only meiosis I results in daughter cells that contain identical genetic information.

Question 3

Homologous chromosomes are separated during _____.

Accepted Answer

A) anaphase II 
B) prophase I 
C) mitosis 
D) anaphase I 
A) anaphase II 
B) prophase I 
C) mitosis 
D) anaphase I

Question 4

If meiosis produces haploid cells,how is the diploid number restored for those organisms that spend most of their life cycle in the diploid state?

Accepted Answer

A) DNA replication 
B) reverse transcription 
C) synapsis 
D) fertilization 
A) DNA replication 
B) reverse transcription 
C) synapsis 
D) fertilization

Question 5

Figure 12.4
-Refer to Figure 12.4.Put the stages of meiosis shown here in the order that they would occur in a cell.

Accepted Answer

A) a,c,d,b 
B) c,a,b,d 
C) c,a,d,b 
D) a,b,c,d 
A) a,c,d,b 
B) c,a,b,d 
C) c,a,d,b 
D) a,b,c,d

Question 6

The bulldog ant has a diploid number of two chromosomes.Therefore,following meiosis,each daughter cell will have a single chromosome.There is/are _____ different possible combination(s)of genes in the daughter cells of meiosis because _____.

Accepted Answer

A) one;there is only one chromosome per cell 
B) two;there are two homologous chromosomes per cell prior to meiosis 
C) more than 2;the two homologues cross over 
A) one;there is only one chromosome per cell 
B) two;there are two homologous chromosomes per cell prior to meiosis 
C) more than 2;the two homologues cross over

Question 7

Quaking aspen can send out underground stems for asexual reproduction.Sexual reproduction is not as common but when it does happen the haploid gametes have 19 chromosomes.How many chromosomes are in the cells of the underground stems?

Accepted Answer

A) 9 
B) 10 
C) 19 
D) 38 
A) 9 
B) 10 
C) 19 
D) 38

Question 8

Homologous chromosomes _____.

Accepted Answer

A) are identical 
B) carry information for the same traits 
C) carry the same alleles 
D) align on the metaphase plate in meiosis II 
A) are identical 
B) carry information for the same traits 
C) carry the same alleles 
D) align on the metaphase plate in meiosis II

Question 9

At what stage of meiosis does DNA replication take place?

Accepted Answer

A) DNA replication does not take place in cells destined to undergo meiosis. 
B) prophase I 
C) between meiosis I and meiosis II 
D) None.DNA replication occurs before meiosis I begins. 
A) DNA replication does not take place in cells destined to undergo meiosis. 
B) prophase I 
C) between meiosis I and meiosis II 
D) None.DNA replication occurs before meiosis I begins.

Question 10

Figure 12.3
-In Figure 12.3,what major event is taking place during this phase of meiosis?

Accepted Answer

A) anaphase II 
B) anaphase 
C) homologues separate 
D) separation of sister chromatids 
A) anaphase II 
B) anaphase 
C) homologues separate 
D) separation of sister chromatids

Question 11

For the duration of meiosis I,each chromosome is _____.

Accepted Answer

A) in the form of a tetrad 
B) two sister chromatids joined by a centromere 
C) a chromosome and its homologue 
D) undergoing synapsis 
A) in the form of a tetrad 
B) two sister chromatids joined by a centromere 
C) a chromosome and its homologue 
D) undergoing synapsis

Question 12

What happens when an individual has an odd number of chromosome sets (e.g. ,triploidy)?

Accepted Answer

A) They produce offspring with an even number of chromosome sets (e.g. ,tetraploid,hexaploid). 
B) Their offspring are often sterile. 
C) They go through three sets of meiosis (meiosis I,meiosis II,and meiosis III) 
D) Their cells are unable to complete meiosis. 
A) They produce offspring with an even number of chromosome sets (e.g. ,tetraploid,hexaploid). 
B) Their offspring are often sterile. 
C) They go through three sets of meiosis (meiosis I,meiosis II,and meiosis III) 
D) Their cells are unable to complete meiosis.

Question 13

Why might the incidence of trisomy from maternal origin be higher than that from paternal origin?
 
Source:
Hassold,T. ,Chiu,D.Human Genetics.1985;70(1):
11-17. )

Accepted Answer

A) Eggs are arrested in meiosis in the mother from approximately birth until ovulation. 
B) Sperm travel to the site of fertilization,and an extra chromosome may slow them down. 
C) Eggs move little from their site of release to the site of fertilization. 
D) All of the above are possible explanations for the higher incidence of trisomy of maternal origin. 
A) Eggs are arrested in meiosis in the mother from approximately birth until ovulation. 
B) Sperm travel to the site of fertilization,and an extra chromosome may slow them down. 
C) Eggs move little from their site of release to the site of fertilization. 
D) All of the above are possible explanations for the higher incidence of trisomy of maternal origin.

Question 14

Which of the following processes contributes directly to genetic variation?

Accepted Answer

A) binary fission 
B) mitosis 
C) meiosis 
D) DNA replication 
A) binary fission 
B) mitosis 
C) meiosis 
D) DNA replication

Exam 12: Meiosis

Crossover,the exchange of segments of homologous chromosomes,takes place during which of the following processes?

What is a major difference between mitosis and meiosis I?

Homologous chromosomes are separated during _____.

If meiosis produces haploid cells,how is the diploid number restored for those organisms that spend most of their life cycle in the diploid state?

Figure 12.4 -Refer to Figure 12.4.Put the stages of meiosis shown here in the order that they would occur in a cell.

The bulldog ant has a diploid number of two chromosomes.Therefore,following meiosis,each daughter cell will have a single chromosome.There is/are _____ different possible combination(s)of genes in the daughter cells of meiosis because _____.

Quaking aspen can send out underground stems for asexual reproduction.Sexual reproduction is not as common but when it does happen the haploid gametes have 19 chromosomes.How many chromosomes are in the cells of the underground stems?

Homologous chromosomes _____.

At what stage of meiosis does DNA replication take place?

Figure 12.3 -In Figure 12.3,what major event is taking place during this phase of meiosis?

For the duration of meiosis I,each chromosome is _____.

What happens when an individual has an odd number of chromosome sets (e.g. ,triploidy)?

Why might the incidence of trisomy from maternal origin be higher than that from paternal origin? Source: Hassold,T. ,Chiu,D.Human Genetics.1985;70(1): 11-17. )

Which of the following processes contributes directly to genetic variation?

Biology and the Tree of Life

Water and Carbon: the Chemical Basis of Life

Protein Structure and Function

Nucleic Acids and the Rna World

An Introduction to Carbohydrates

Lipids, membranes, and the First Cells

Inside the Cell

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The Cell Cycle

Mendel and the Gene

Dna and the Gene: Synthesis and Repair

How Genes Work

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Control of Gene Expression in Eukaryotes

Analyzing and Engineering Genes

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An Introduction to Animal Development

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Phylogenies and the History of Life

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An Introduction to Animals

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The Immune System in Animals

An Introduction to Ecology

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The bulldog ant has a diploid number of two chromosomes.Therefore,following meiosis,each daughter cell will have a single chromosome.There is/are _ different possible combination(s)of genes in the daughter cells of meiosis because _.