Question 1

Why are recessive X-linked traits more commonly seen in men than in women?

Accepted Answer

Because expression of an X-linked trait

Question 2

In _______________________ chromosomes,the centromere is closer to one end than to the middle.

Accepted Answer

A)  metacentric 
B)  telocentric 
C)  acrocentric 
D)  paracentric 
E)  acentric 
A)  metacentric 
B)  telocentric 
C)  acrocentric 
D)  paracentric 
E)  acentric

Question 3

Sister chromatids are identical chromosomes,duplicated during S-phase and still attached to each other.

Accepted Answer

A) True 
 B)False

Question 4

A ____________________________ is an image of all the chromosomes of an organism arranged into pairs based on staining pattern and,by convention,in decreasing size,with sex chromosomes last.

Accepted Answer

A)  karyotype 
B)  chromogram 
C)  chromotype 
D)  genome map 
E)  linkage map 
A)  karyotype 
B)  chromogram 
C)  chromotype 
D)  genome map 
E)  linkage map

Question 5

A female fruit fly with vermilion eyes and normal wings is crossed with a male with normal red eyes and cut wings.The F1 progeny consist of females with red eyes and normal wings,and males with vermilion eyes and normal wings.When the F1 progeny are interbred,the F2 consists of two types of females-vermilion eyes,normal wings (1/2)and red eyes,normal wings (1/2),and two types of males-vermilion eyes,normal wings (1/2)and red eyes,cut wings (1/2).Are the genes for eye colour and wing type X-linked or autosomal?

Accepted Answer

A)  The eye-colour gene is X-linked and the wing-type gene is autosomal. 
B)  The eye-colour gene is autosomal and the wing-type gene is X-linked. 
C)  Both genes are X-linked. 
D)  Both genes are autosomal. 
E)  More than one of the choices is consistent with the data. 
A)  The eye-colour gene is X-linked and the wing-type gene is autosomal. 
B)  The eye-colour gene is autosomal and the wing-type gene is X-linked. 
C)  Both genes are X-linked. 
D)  Both genes are autosomal. 
E)  More than one of the choices is consistent with the data.

Question 6

Mitosis does not play any role in gametogenesis.

Accepted Answer

A) True 
 B)False

Question 7

The smaller diploid sister cell that results during meiosis I in females is called a _____________________________.

Accepted Answer

A)  nucleolus 
B)  Barr body 
C)  polar body 
D)  microcyte 
E)  sister chromatid 
A)  nucleolus 
B)  Barr body 
C)  polar body 
D)  microcyte 
E)  sister chromatid

Question 8

A multinucleate plant tissue is called a

Accepted Answer

A)  paranucleus 
B)  mitocyte 
C)  meiocyte 
D)  syncytium 
E)  coenocyte 
A)  paranucleus 
B)  mitocyte 
C)  meiocyte 
D)  syncytium 
E)  coenocyte

Question 9

In chickens,it is the females that have two different sex chromosomes (Z and W)while the males have two Z chromosomes.A Z-linked gene controls the pattern of the feathers,with the dominant B allele causing the barred pattern and the b allele causing nonbarred feathers.From which of the following crosses would all of the daughters be of one type (barred or nonbarred)and all of the sons the other type?

Accepted Answer

A)  barred females × nonbarred males 
B)  nonbarred females × barred males 
C)  nonbarred females × nonbarred males 
D)  barred females × barred males 
E)  More than one of the choices are correct. 
A)  barred females × nonbarred males 
B)  nonbarred females × barred males 
C)  nonbarred females × nonbarred males 
D)  barred females × barred males 
E)  More than one of the choices are correct.

Question 10

Polar microtubules are short and unstable and extend out from the centrosome toward the cell's periphery.

Accepted Answer

A) True 
 B)False

Question 11

A white-eyed female fruit fly is mated to a red-eyed male.One of their progeny is a white-eyed female.This white-eyed daughter likely arose from nondisjunction of the sex chromosomes during _________ in the _________.

Accepted Answer

A)  meiosis I;mother 
B)  meiosis II;mother 
C)  meiosis I;father 
D)  meiosis II;father 
E)  meiosis I or II;mother 
A)  meiosis I;mother 
B)  meiosis II;mother 
C)  meiosis I;father 
D)  meiosis II;father 
E)  meiosis I or II;mother

Question 12

The literal meaning of chromosome is

Accepted Answer

A)  paired element 
B)  inheritance factor 
C)  coloured body 
D)  recombination 
E)  small animal 
A)  paired element 
B)  inheritance factor 
C)  coloured body 
D)  recombination 
E)  small animal

Question 13

Which type of chromosome provides the basis for sex determination in many sexually reproducing organisms?

Accepted Answer

A)  haploid 
B)  diploid 
C)  autosomes 
D)  sex chromosomes 
E)  homologous chromosomes 
A)  haploid 
B)  diploid 
C)  autosomes 
D)  sex chromosomes 
E)  homologous chromosomes

Question 14

A somatic cell is a cell destined for a specialized role in the production of gametes.

Accepted Answer

A) True 
 B)False

Question 15

Crossing-over between homologous chromosomes occurs at which of the following stages of meiosis?

Accepted Answer

A)  S phase 
B)  prophase I 
C)  metaphase I 
D)  anaphase I 
E)  prophase II 
A)  S phase 
B)  prophase I 
C)  metaphase I 
D)  anaphase I 
E)  prophase II

Question 16

In the following pedigree,the indicated trait is caused by which type of allele? Assume the trait is fully penetrant and that the trait is rare in the population,so that alleles for the trait are not carried by anyone who is not the progeny of a mating shown in the pedigree.

Accepted Answer

A)  autosomal recessive 
B)  autosomal dominant 
C)  X-linked recessive 
D)  X-linked dominant 
E)  Y-linked 
A)  autosomal recessive 
B)  autosomal dominant 
C)  X-linked recessive 
D)  X-linked dominant 
E)  Y-linked

Question 17

If a geneticist were to closely examine the make-up of a single autosomal chromosome from one of your cells,that chromosome would be found to be

Accepted Answer

A)  derived entirely from genes from just one of your grandparents. 
B)  a mosaic of genes derived from your mother and father. 
C)  a mosaic of genes derived from all four of your grandparents. 
D)  a mosaic of genes derived from just two of your grandparents-either your two grandfathers or your two grandmothers. 
E)  a mosaic of genes derived from just two of your grandparents-either your maternal grandparents or your paternal grandparents. 
A)  derived entirely from genes from just one of your grandparents. 
B)  a mosaic of genes derived from your mother and father. 
C)  a mosaic of genes derived from all four of your grandparents. 
D)  a mosaic of genes derived from just two of your grandparents-either your two grandfathers or your two grandmothers. 
E)  a mosaic of genes derived from just two of your grandparents-either your maternal grandparents or your paternal grandparents.

Question 18

Give examples of three different systems by which chromosomes determine sex,including organisms in which these systems are found.

Accepted Answer

XX females,XY males-humans,fru

Question 19

A cell with three pairs of chromosomes has the genotype AaBbCc,such that each pair of alleles is on a different pair of chromosomes.If this cell were to undergo mitotic division,how many genetically different types of gametes could be produced?

Accepted Answer

A)  1 
B)  3 
C)  6 
D)  8 
E)  9 
A)  1 
B)  3 
C)  6 
D)  8 
E)  9

Question 20

Which of the following helps explain why increased maternal age is correlated with an increased risk of Down syndrome?

Accepted Answer

A)  mutations accumulate in the germ line in a time-dependent manner 
B)  meiosis in oocytes is incomplete before fertilization 
C)  frequency of crossovers increases with gamete age 
D)  barriers to double fertilization decrease in older ova 
E)  kinetochore fusion is more common in older women 
A)  mutations accumulate in the germ line in a time-dependent manner 
B)  meiosis in oocytes is incomplete before fertilization 
C)  frequency of crossovers increases with gamete age 
D)  barriers to double fertilization decrease in older ova 
E)  kinetochore fusion is more common in older women

Why are recessive X-linked traits more commonly seen in men than in women?

In _______________________ chromosomes,the centromere is closer to one end than to the middle.

Sister chromatids are identical chromosomes,duplicated during S-phase and still attached to each other.

A ____________________________ is an image of all the chromosomes of an organism arranged into pairs based on staining pattern and,by convention,in decreasing size,with sex chromosomes last.

Mitosis does not play any role in gametogenesis.

The smaller diploid sister cell that results during meiosis I in females is called a _____________________________.

A multinucleate plant tissue is called a

Polar microtubules are short and unstable and extend out from the centrosome toward the cell's periphery.

A white-eyed female fruit fly is mated to a red-eyed male.One of their progeny is a white-eyed female.This white-eyed daughter likely arose from nondisjunction of the sex chromosomes during _ in the _.

The literal meaning of chromosome is

Which type of chromosome provides the basis for sex determination in many sexually reproducing organisms?

A somatic cell is a cell destined for a specialized role in the production of gametes.

Crossing-over between homologous chromosomes occurs at which of the following stages of meiosis?

In the following pedigree,the indicated trait is caused by which type of allele? Assume the trait is fully penetrant and that the trait is rare in the population,so that alleles for the trait are not carried by anyone who is not the progeny of a mating shown in the pedigree.

If a geneticist were to closely examine the make-up of a single autosomal chromosome from one of your cells,that chromosome would be found to be

Give examples of three different systems by which chromosomes determine sex,including organisms in which these systems are found.

A cell with three pairs of chromosomes has the genotype AaBbCc,such that each pair of alleles is on a different pair of chromosomes.If this cell were to undergo mitotic division,how many genetically different types of gametes could be produced?

Which of the following helps explain why increased maternal age is correlated with an increased risk of Down syndrome?

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

Exam 2: Extensions to Mendels Laws

Why are recessive X-linked traits more commonly seen in men than in women?

In _______________________ chromosomes,the centromere is closer to one end than to the middle.

Sister chromatids are identical chromosomes,duplicated during S-phase and still attached to each other.

A ____________________________ is an image of all the chromosomes of an organism arranged into pairs based on staining pattern and,by convention,in decreasing size,with sex chromosomes last.

Mitosis does not play any role in gametogenesis.

The smaller diploid sister cell that results during meiosis I in females is called a _____________________________.

A multinucleate plant tissue is called a

Polar microtubules are short and unstable and extend out from the centrosome toward the cell's periphery.

A white-eyed female fruit fly is mated to a red-eyed male.One of their progeny is a white-eyed female.This white-eyed daughter likely arose from nondisjunction of the sex chromosomes during _________ in the _________.

The literal meaning of chromosome is

Which type of chromosome provides the basis for sex determination in many sexually reproducing organisms?

A somatic cell is a cell destined for a specialized role in the production of gametes.

Crossing-over between homologous chromosomes occurs at which of the following stages of meiosis?

In the following pedigree,the indicated trait is caused by which type of allele? Assume the trait is fully penetrant and that the trait is rare in the population,so that alleles for the trait are not carried by anyone who is not the progeny of a mating shown in the pedigree.

If a geneticist were to closely examine the make-up of a single autosomal chromosome from one of your cells,that chromosome would be found to be

Give examples of three different systems by which chromosomes determine sex,including organisms in which these systems are found.

A cell with three pairs of chromosomes has the genotype AaBbCc,such that each pair of alleles is on a different pair of chromosomes.If this cell were to undergo mitotic division,how many genetically different types of gametes could be produced?

Which of the following helps explain why increased maternal age is correlated with an increased risk of Down syndrome?

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

A white-eyed female fruit fly is mated to a red-eyed male.One of their progeny is a white-eyed female.This white-eyed daughter likely arose from nondisjunction of the sex chromosomes during _ in the _.