Question 1

The process of matching chromosomes becoming zipped together during the zygotene stage of prophase I is called

Accepted Answer

A)  crossover 
B)  recombination 
C)  morphogenesis 
D)  synapsis 
E)  reassortment 
A)  crossover 
B)  recombination 
C)  morphogenesis 
D)  synapsis 
E)  reassortment D

Question 2

The cells in which meiosis occurs in males are referred to as

Accepted Answer

A)  spermatocytes 
B)  spermatogonia 
C)  spermatids 
D)  oocytes 
E)  sperm 
A)  spermatocytes 
B)  spermatogonia 
C)  spermatids 
D)  oocytes 
E)  sperm A

Question 3

The nonsex chromosomes are called autosomes.

Accepted Answer

A) True 
 B)False  True

Question 4

In Drosophila virilis,nuclei of somatic cells contain 12 chromosomes while nuclei of sperm cells contain only 6 chromosomes.What does "n" equal for this species?

Accepted Answer

A)  3 
B)  6 
C)  12 
D)  24 
E)  6 or 12,depending on cell type 
A)  3 
B)  6 
C)  12 
D)  24 
E)  6 or 12,depending on cell type

Question 5

In humans,why is pattern baldness seen only in men?

Accepted Answer

Pattern baldness is an example of sex-in

Question 6

During which of the following stages of the cell cycle would a chromosome consist of only a single chromatid?

Accepted Answer

A)  G1 
B)  G2 
C)  mitotic prophase 
D)  mitotic metaphase 
E)  S 
A)  G1 
B)  G2 
C)  mitotic prophase 
D)  mitotic metaphase 
E)  S

Question 7

A cross between a white-eyed female fruit fly and a red-eyed male would generate which of the following types of progeny?

Accepted Answer

A)  red-eyed females and white-eyed males 
B)  white-eyed females and red-eyed males 
C)  all red-eyed females and a 50:50 mixture of white-eyed and red-eyed males 
D)  all red-eyed males and a 50:50 mixture of white-eyed and red-eyed females 
E)  The result cannot be predicted because it depends on whether the female is homozygous or heterozygous. 
A)  red-eyed females and white-eyed males 
B)  white-eyed females and red-eyed males 
C)  all red-eyed females and a 50:50 mixture of white-eyed and red-eyed males 
D)  all red-eyed males and a 50:50 mixture of white-eyed and red-eyed females 
E)  The result cannot be predicted because it depends on whether the female is homozygous or heterozygous.

Question 8

Chromosomes attach to microtubules through linkage groups.

Accepted Answer

A) True 
 B)False

Question 9

What was the evidence that led Walter Sutton to conclude that the X and Y chromosomes determine sex?

Accepted Answer

Sutton studied the chromosomes

Question 10

How do amniocentesis and chorionic villus sampling (CVS)differ?

Accepted Answer

A)  Only amniocentesis can be used for karyotyping. 
B)  Only CVS samples are placed in culture medium after collection. 
C)  Only CVS isolates fetal cells. 
D)  CVS can detect only Down syndrome,not any other abnormalities. 
E)  Fewer cells are collected during amniocentesis than during CVS. 
A)  Only amniocentesis can be used for karyotyping. 
B)  Only CVS samples are placed in culture medium after collection. 
C)  Only CVS isolates fetal cells. 
D)  CVS can detect only Down syndrome,not any other abnormalities. 
E)  Fewer cells are collected during amniocentesis than during CVS.

Question 11

The period between cell cycles is called interphase.

Accepted Answer

A) True 
 B)False

Question 12

Chromosomes that carry the same genes,but not necessarily the same alleles are called

Accepted Answer

A)  sister chromatids 
B)  homologues 
C)  paralogs 
D)  parameres 
E)  chromomeres 
A)  sister chromatids 
B)  homologues 
C)  paralogs 
D)  parameres 
E)  chromomeres

Question 13

Mitosis results in _______ chromosome number,whereas meiosis results in _______ chromosome number.

Accepted Answer

A)  a doubling of;no change in 
B)  no change in;no change in 
C)  a reduction by half in;no change in 
D)  no change in;a doubling of 
E)  no change in;a reduction by half in 
A)  a doubling of;no change in 
B)  no change in;no change in 
C)  a reduction by half in;no change in 
D)  no change in;a doubling of 
E)  no change in;a reduction by half in

Question 14

Which of the following best describes a collection of animal embryonic cells that undergoes mitotic divisions to yield specialized diploid cells,which undergo meiosis?

Accepted Answer

A)  corpus luteum 
B)  germ line 
C)  oocyte 
D)  ova 
E)  spermatocyte 
A)  corpus luteum 
B)  germ line 
C)  oocyte 
D)  ova 
E)  spermatocyte

Question 15

Drosophila melanogaster has four pairs of chromosomes.Sperm from this species are formed by a meiotic process in which homologous chromosomes pair and segregate but do not undergo crossing-over.How many genetically different kinds of sperm could be produced by a Drosophila melanogaster male?

Accepted Answer

A)  4 
B)  8 
C)  16 
D)  64 
E)  256 
A)  4 
B)  8 
C)  16 
D)  64 
E)  256

Question 16

What are the advantages of chorionic villus sampling (CVS)compared to amniocentesis?

Accepted Answer

A)  Ultrasound imaging is not generally required for CVS. 
B)  More diseases can be detected using CVS than using amniocentesis. 
C)  CVS has a significantly low risk of miscarriage. 
D)  CVS may be performed earlier in pregnancy than amniocentesis. 
E)  CVS allows diagnosis without karyotyping. 
A)  Ultrasound imaging is not generally required for CVS. 
B)  More diseases can be detected using CVS than using amniocentesis. 
C)  CVS has a significantly low risk of miscarriage. 
D)  CVS may be performed earlier in pregnancy than amniocentesis. 
E)  CVS allows diagnosis without karyotyping.

Question 17

The mitotic stage during which chromosomes begin attaching to spindle fibers and moving randomly and reversibly to the centrosomes is

Accepted Answer

A)  prophase 
B)  prometaphase 
C)  metaphase 
D)  anaphase 
E)  telophase 
A)  prophase 
B)  prometaphase 
C)  metaphase 
D)  anaphase 
E)  telophase

Question 18

What aspect of chromosome behaviour most clearly accounts for Mendel's law of independent assortment?

Accepted Answer

A)  Movement of sister chromatids to opposite poles at anaphase II of meiosis 
B)  Movement of homologous chromosomes to opposite poles at anaphase I of meiosis 
C)  Crossing-over between homologous chromosomes during prophase I of meiosis 
D)  Replication of chromosomes prior to meiosis 
E)  Independent alignment of different homologous pairs on the metaphase I spindle 
A)  Movement of sister chromatids to opposite poles at anaphase II of meiosis 
B)  Movement of homologous chromosomes to opposite poles at anaphase I of meiosis 
C)  Crossing-over between homologous chromosomes during prophase I of meiosis 
D)  Replication of chromosomes prior to meiosis 
E)  Independent alignment of different homologous pairs on the metaphase I spindle

Question 19

During pachytene,structures called recombination nodules begin to appear along the synaptonemal complex,and an exchange of parts between nonsister chromatids occurs at these nodules.

Accepted Answer

A) True 
 B)False

Question 20

In humans,XO individuals are females with Turner's syndrome and XXY individuals are males with Klinefelter syndrome.Which of the following events may not give rise to a Klinefelter male?

Accepted Answer

A)  nondisjunction at meiosis I in the mother 
B)  nondisjunction at meiosis II in the mother 
C)  nondisjunction at meiosis I in the father 
D)  nondisjunction at meiosis II in the father 
E)  All of the choices could give rise to a Klinefelter male. 
A)  nondisjunction at meiosis I in the mother 
B)  nondisjunction at meiosis II in the mother 
C)  nondisjunction at meiosis I in the father 
D)  nondisjunction at meiosis II in the father 
E)  All of the choices could give rise to a Klinefelter male.

Exam 2: Extensions to Mendels Laws

The process of matching chromosomes becoming zipped together during the zygotene stage of prophase I is called

The cells in which meiosis occurs in males are referred to as

The nonsex chromosomes are called autosomes.

In Drosophila virilis,nuclei of somatic cells contain 12 chromosomes while nuclei of sperm cells contain only 6 chromosomes.What does "n" equal for this species?

In humans,why is pattern baldness seen only in men?

During which of the following stages of the cell cycle would a chromosome consist of only a single chromatid?

A cross between a white-eyed female fruit fly and a red-eyed male would generate which of the following types of progeny?

Chromosomes attach to microtubules through linkage groups.

What was the evidence that led Walter Sutton to conclude that the X and Y chromosomes determine sex?

How do amniocentesis and chorionic villus sampling (CVS)differ?

The period between cell cycles is called interphase.

Chromosomes that carry the same genes,but not necessarily the same alleles are called

Mitosis results in _______ chromosome number,whereas meiosis results in _______ chromosome number.

Which of the following best describes a collection of animal embryonic cells that undergoes mitotic divisions to yield specialized diploid cells,which undergo meiosis?

Drosophila melanogaster has four pairs of chromosomes.Sperm from this species are formed by a meiotic process in which homologous chromosomes pair and segregate but do not undergo crossing-over.How many genetically different kinds of sperm could be produced by a Drosophila melanogaster male?

What are the advantages of chorionic villus sampling (CVS)compared to amniocentesis?

The mitotic stage during which chromosomes begin attaching to spindle fibers and moving randomly and reversibly to the centrosomes is

What aspect of chromosome behaviour most clearly accounts for Mendel's law of independent assortment?

During pachytene,structures called recombination nodules begin to appear along the synaptonemal complex,and an exchange of parts between nonsister chromatids occurs at these nodules.

In humans,XO individuals are females with Turner's syndrome and XXY individuals are males with Klinefelter syndrome.Which of the following events may not give rise to a Klinefelter male?

Mendels Principles of Heredity

The Chromosome Theory of Inheritance

Linkage, Recombination, and the Mapping of Genes on Chromosomes

Dna Structure, Replication, and Recombination

Anatomy and Function of a Gene: Dissection Through Mutation

Gene Expression: the Flow of Information From Dna to Rna to Protein

Digital Analysis of Genomes

Genome Annotation

Analyzing Genomic Variation

The Eukaryotic Chromosome

Chromosomal Rearrangements and Changes in Chromosome Number

Bacterial Genetics

Organellar Inheritance

Gene Regulation in Prokaryotes

Gene Regulation in Eukaryotes

Manipulating the Genomes of Eukaryotes

The Genetic Analysis of Development

The Genetics of Cancer

Variation and Selection in Populations

Genetics of Complex Traits

Exploring Synthetic Biology: Concepts, Techniques, and Applications

Filters

Mitosis results in _ chromosome number,whereas meiosis results in _ chromosome number.