Question 1

In familial Down syndrome resulting from Robertsonian translocation,

Accepted Answer

A) the affected individual has three copies of the complete chromosome 21. 
B) the affected individual is missing a copy of chromosome 21. 
C) the affected individual has three copies of the long arm of chromosome 21,one of which is attached to part of chromosome 14. 
D) the affected individual has two copies of the long arm of chromosome 21,one of which is attached to part of chromosome 14. 
E) the affected individual has three copies of the long arm of chromosome 14,one of which is attached to chromosome 21. 
A) the affected individual has three copies of the complete chromosome 21. 
B) the affected individual is missing a copy of chromosome 21. 
C) the affected individual has three copies of the long arm of chromosome 21,one of which is attached to part of chromosome 14. 
D) the affected individual has two copies of the long arm of chromosome 21,one of which is attached to part of chromosome 14. 
E) the affected individual has three copies of the long arm of chromosome 14,one of which is attached to chromosome 21. C

Question 2

The causes of chromosomal deletion may include radiation,viral infection,chemical exposure,or transposable elements.

Accepted Answer

A) True 
 B)False  True

Question 3

In humans,many types of cancers are associated with chromosomal mutations.

Accepted Answer

A) True 
 B)False  True

Question 4

Match between columns
                        Premises: Down syndrome
Edwards syndrome
Klinefelter syndrome
Turner syndrome
Patau syndrome

Accepted Answer

The Answer of Three copies of chromosome 18 and Three is...

Question 5

Which of the following types of chromosomal mutation cannot revert to the wild-type state?

Accepted Answer

A) Duplication 
B) Deletion 
C) Translocation 
D) Inversion 
E) Any of these may revert to wild-type 
A) Duplication 
B) Deletion 
C) Translocation 
D) Inversion 
E) Any of these may revert to wild-type

Question 6

Which of the following types of analysis allows scientists to visualize an individual's chromosomal makeup?

Accepted Answer

A) Karyotype analysis 
B) Pedigree analysis 
C) Genetic crosses 
D) Inheritance analysis 
E) Deletion mapping 
A) Karyotype analysis 
B) Pedigree analysis 
C) Genetic crosses 
D) Inheritance analysis 
E) Deletion mapping

Question 7

What are the gametic consequences of a lack of cytokinesis following the first or second meiotic division?

Accepted Answer

The result will be a change in the numbe

Question 8

How is hybrid sterility overcome in allopolyploid plants?

Accepted Answer

Typically,allopolyploids are produced wh

Question 9

A dicentric chromosome has two

Accepted Answer

A) arms. 
B) centromeres. 
C) telomeres. 
D) mutations. 
E) centrosomes. 
A) arms. 
B) centromeres. 
C) telomeres. 
D) mutations. 
E) centrosomes.

Question 10

Match between columns
                        Premises: Triploid
Trisomic
Aneuploid
Euploid
Polyploid

Accepted Answer

The Answer of A chromosome number that is not an is...

Question 11

Inversion loops form to allow homologous chromosomes containing homozygous inversions to pair properly during meiosis.

Accepted Answer

A) True 
 B)False

Question 12

What is the genetic consequence of a homozygous translocation?

Accepted Answer

A) Inviable gamete formation (semisterility) 
B) Gene duplications and deletions 
C) Formation of abnormal chromatids following crossing-over 
D) Abnormal pairing during meiosis 
E) An alteration in the linkage relationships of genes 
A) Inviable gamete formation (semisterility) 
B) Gene duplications and deletions 
C) Formation of abnormal chromatids following crossing-over 
D) Abnormal pairing during meiosis 
E) An alteration in the linkage relationships of genes

Question 13

Which of the following is not used to help identify individual chromosomes in a karyotype?

Accepted Answer

A) Centromere position 
B) Point mutations 
C) Chromosome size 
D) Banding pattern on staining 
E) Heterochromatin regions 
A) Centromere position 
B) Point mutations 
C) Chromosome size 
D) Banding pattern on staining 
E) Heterochromatin regions

Question 14

A tetraploid cell contains four chromosomes.

Accepted Answer

A) True 
 B)False

Question 15

How does a Philadelphia chromosome occur,and what condition does it cause?

Accepted Answer

Ninety percent of patients with the fata

Question 16

During meiosis,what are the gametic consequences of a paracentric inversion with a single crossover event,compared to a pericentric inversion with a single crossover?

Accepted Answer

The paracentric inversion results in two

Question 17

Seedless bananas are produced from

Accepted Answer

A) sterile tetraploid allopolyploid plants. 
B) sterile triploid autopolyploid plants. 
C) monoploid plants grown from unfertilized seeds. 
D) fertile diploid plants that are unfertilized. 
E) Both C and D 
A) sterile tetraploid allopolyploid plants. 
B) sterile triploid autopolyploid plants. 
C) monoploid plants grown from unfertilized seeds. 
D) fertile diploid plants that are unfertilized. 
E) Both C and D

Question 18

What are all the possible gametic genotypes produced by a trisomic individual that is genotype A/A+/B for the trisomic chromosome?

Accepted Answer

Three types of haploid gametes

Question 19

Down syndrome (trisomy-21)is the only human autosomal trisomy in which the individuals may survive to adulthood.

Accepted Answer

A) True 
 B)False

Question 20

During meiosis in a reciprocal translocation heterozygote,what are the three ways that chromosomes may segregate at anaphase I,and what are the consequences for the resulting gametes?

Accepted Answer

In alternate segregation,alternate centr

Exam 16: Variations in Chromosome Structure and Number

In familial Down syndrome resulting from Robertsonian translocation,

The causes of chromosomal deletion may include radiation,viral infection,chemical exposure,or transposable elements.

In humans,many types of cancers are associated with chromosomal mutations.

Which of the following types of chromosomal mutation cannot revert to the wild-type state?

Which of the following types of analysis allows scientists to visualize an individual's chromosomal makeup?

What are the gametic consequences of a lack of cytokinesis following the first or second meiotic division?

How is hybrid sterility overcome in allopolyploid plants?

A dicentric chromosome has two

Inversion loops form to allow homologous chromosomes containing homozygous inversions to pair properly during meiosis.

What is the genetic consequence of a homozygous translocation?

Which of the following is not used to help identify individual chromosomes in a karyotype?

A tetraploid cell contains four chromosomes.

How does a Philadelphia chromosome occur,and what condition does it cause?

During meiosis,what are the gametic consequences of a paracentric inversion with a single crossover event,compared to a pericentric inversion with a single crossover?

Seedless bananas are produced from

What are all the possible gametic genotypes produced by a trisomic individual that is genotype A/A+/B for the trisomic chromosome?

Down syndrome (trisomy-21)is the only human autosomal trisomy in which the individuals may survive to adulthood.

During meiosis in a reciprocal translocation heterozygote,what are the three ways that chromosomes may segregate at anaphase I,and what are the consequences for the resulting gametes?

Genetics: An Introduction

DNA: The Genetic Material

DNA Replication

Gene Function

Gene Expression: Transcription

Gene Expression: Translation

Dna Mutation, DNA Repair, and Transposable Elements

Genomics: The Mapping and Sequencing of Genomes

Functional and Comparative Genomics

Recombinant DNA Technology

Mendelian Genetics

Chromosomal Basis of Inheritance

Extensions of and Deviations From Mendelian Genetic Principles

Genetic Mapping in Eukaryotes

Genetics of Bacteria and Bacteriophages

Regulation of Gene Expression in Bacteria and Bacteriophages

Regulation of Gene Expression in Eukaryotes

Genetic Analysis of Development

Genetics of Cancer

Population Genetics

Quantitative Genetics

Molecular Evolution

Filters

What are all the possible gametic genotypes produced by a trisomic individual that is genotype A/A^+/B for the trisomic chromosome?