Question 1

A chromosome with two arms of equal length is referred to as

Accepted Answer

A) acrocentric. 
B) homologous. 
C) telocentric. 
D) metazoan. 
E) metacentric. 
A) acrocentric. 
B) homologous. 
C) telocentric. 
D) metazoan. 
E) metacentric.

Question 2

Here is a list of meiotic events in no particular order.A Segregation of homologous chromosomes to opposite poles.B Segregation of sister chromatids to opposite poles.C Alignment of homologous pairs on the midplate of the cell.D Pairing and synapsis of homologous chromosomes.E Condensation of chromosomes in a diploid nucleus.What is the correct order of events?

Accepted Answer

A) CDEAB 
B) DCEBA 
C) EDCBA 
D) EDCAB 
E) DCABE 
A) CDEAB 
B) DCEBA 
C) EDCBA 
D) EDCAB 
E) DCABE

Question 3

Color vision depends upon the dominant alleles of three genes: the R gene and the G gene are both on the X chromosome, while the B gene is autosomal.Recessive mutations in any of the three genes can cause color blindness.Suppose a colorblind man marries a colorblind woman and all of their offspring have normal vision.What is the genotype of the woman?

Accepted Answer

A) RRGGbb 
B) RRggBB 
C) rrGGbb 
D) RRggBB or RRGGbb 
E) rrGGbb or rrggBB 
A) RRGGbb 
B) RRggBB 
C) rrGGbb 
D) RRggBB or RRGGbb 
E) rrGGbb or rrggBB

Question 4

Which term describes chromosomes where the centromere is located closer to one end of the chromosome?

Accepted Answer

A) Metacentric 
B) Acrocentric 
C) Holocentric 
D) Anacentric 
A) Metacentric 
B) Acrocentric 
C) Holocentric 
D) Anacentric

Question 5

A variable feature of some chromosomes in corn is the presence or absence of knobs at particular sites.Suppose that one member of each of two pairs of chromosomes in a corn plant has a knob.If this plant is crossed with a knobless plant, what percentage of the offspring is expected to be knobless?

Accepted Answer

A) 100% 
B) 75% 
C) 50% 
D) 25% 
E) 0% 
A) 100% 
B) 75% 
C) 50% 
D) 25% 
E) 0%

Question 6

In the following pedigree, the indicated trait is caused by which type of allele?

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 7

At which of the following stages of meiosis would homologous chromosomes be paired?

Accepted Answer

A) prophase of meiosis I 
B) prophase of meiosis II 
C) metaphase of meiosis I 
D) metaphase of meiosis II 
E) both prophase of meiosis I and metaphase of meiosis I. 
A) prophase of meiosis I 
B) prophase of meiosis II 
C) metaphase of meiosis I 
D) metaphase of meiosis II 
E) both prophase of meiosis I and metaphase of meiosis I.

Question 8

In human oogenesis, how many chromosomes does an ovum carry?

Accepted Answer

A) 22 
B) 23 
C) 44 
D) 46 
E) 96 
A) 22 
B) 23 
C) 44 
D) 46 
E) 96

Question 9

In human oogenesis, how many chromosomes does a secondary oocyte carry?

Accepted Answer

A) 22 
B) 23 
C) 44 
D) 46 
E) 96 
A) 22 
B) 23 
C) 44 
D) 46 
E) 96

Question 10

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 11

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 12

Microtubules that attach to centrosomes but not chromosomes and that interdigitate with microtubules emanating from the centrosome at the opposite pole are known as

Accepted Answer

A) kinetochore microtubules. 
B) polar microtubules. 
C) astral microtubules. 
D) interdigitating microtubules. 
E) None of the choices is correct. 
A) kinetochore microtubules. 
B) polar microtubules. 
C) astral microtubules. 
D) interdigitating microtubules. 
E) None of the choices is correct.

Question 13

Nondisjunction can occur at either the first or second division of meiosis.XYY individuals would most likely arise from nondisjunction at the ______ meiotic division in the ______.

Accepted Answer

A) first, mother 
B) second, mother 
C) first, father 
D) second, father 
E) More than one of the choices could give rise to XYY individuals. 
A) first, mother 
B) second, mother 
C) first, father 
D) second, father 
E) More than one of the choices could give rise to XYY individuals.

Question 14

The stage of mitosis when chromosomes condense to form rod-shaped structures visible under the microscope is called

Accepted Answer

A) interphase. 
B) prophase. 
C) metaphase. 
D) anaphase. 
E) telophase. 
A) interphase. 
B) prophase. 
C) metaphase. 
D) anaphase. 
E) telophase.

Question 15

Premeiotic germ cells that divide mitotically in females are referred to as

Accepted Answer

A) primary oocytes. 
B) secondary oocytes. 
C) ootids. 
D) oogonia. 
E) ova. 
A) primary oocytes. 
B) secondary oocytes. 
C) ootids. 
D) oogonia. 
E) ova.

Question 16

Cells in the G2 stage of the cell cycle have ______ as cells of the same species in the G1 stage.

Accepted Answer

A) twice as many chromosomes 
B) twice as many chromatids 
C) half as many chromatids 
D) the same number of chromatids 
E) half as many chromosomes 
A) twice as many chromosomes 
B) twice as many chromatids 
C) half as many chromatids 
D) the same number of chromatids 
E) half as many chromosomes

Question 17

Suppose you discover a new species of worm that exists in two forms-slimy and non-slimy.You find that mating slimy females to non-slimy males produces offspring consisting of slimy males and non-slimy females, whereas mating non-slimy females with slimy males produces offspring of both sexes that are all slimy.You would conclude that the _________ allele is dominant and that ________ are the heterogametic sex (the sex with two different sex chromosomes) in this species of worm.

Accepted Answer

A) slimy, females 
B) slimy, males 
C) non-slimy, females 
D) non-slimy, males 
A) slimy, females 
B) slimy, males 
C) non-slimy, females 
D) non-slimy, males

Question 18

If you are a male, your X chromosome contains genes derived from

Accepted Answer

A) your paternal grandfather only. 
B) your maternal grandfather only. 
C) both your paternal and maternal grandfathers. 
D) both your paternal grandfather and grandmother. 
E) both your maternal grandfather and grandmother. 
A) your paternal grandfather only. 
B) your maternal grandfather only. 
C) both your paternal and maternal grandfathers. 
D) both your paternal grandfather and grandmother. 
E) both your maternal grandfather and grandmother.

Question 19

Suppose you discovered a new mutation in mice that causes a curved spine.You noticed that this mutation is seen only in females.When curved-spine females are crossed with normal males, the progeny are always recovered in the ratio: 1/3 curved-spine females, 1/3 normal females, 1/3 normal males.Explain the genetic basis for this ratio.

Accepted Answer

A) Lethal autosomal allele 
B) Lethal sex-linked allele 
C) Recessive sex-linked allele 
D) Recessive autosomal allele 
E) Dominant sex-linked allele 
A) Lethal autosomal allele 
B) Lethal sex-linked allele 
C) Recessive sex-linked allele 
D) Recessive autosomal allele 
E) Dominant sex-linked allele

Question 20

In which of the following cases will a Barr body be seen?

Accepted Answer

A) only XX 
B) XY 
C) XO 
D) only XXY 
E) both XX and XXY 
A) only XX 
B) XY 
C) XO 
D) only XXY 
E) both XX and XXY

A chromosome with two arms of equal length is referred to as

Which term describes chromosomes where the centromere is located closer to one end of the chromosome?

A variable feature of some chromosomes in corn is the presence or absence of knobs at particular sites.Suppose that one member of each of two pairs of chromosomes in a corn plant has a knob.If this plant is crossed with a knobless plant, what percentage of the offspring is expected to be knobless?

In the following pedigree, the indicated trait is caused by which type of allele?

At which of the following stages of meiosis would homologous chromosomes be paired?

In human oogenesis, how many chromosomes does an ovum carry?

In human oogenesis, how many chromosomes does a secondary oocyte carry?

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?

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

Microtubules that attach to centrosomes but not chromosomes and that interdigitate with microtubules emanating from the centrosome at the opposite pole are known as

Nondisjunction can occur at either the first or second division of meiosis.XYY individuals would most likely arise from nondisjunction at the meiotic division in the .

The stage of mitosis when chromosomes condense to form rod-shaped structures visible under the microscope is called

Premeiotic germ cells that divide mitotically in females are referred to as

Cells in the G₂ stage of the cell cycle have ______ as cells of the same species in the G₁ stage.

If you are a male, your X chromosome contains genes derived from

In which of the following cases will a Barr body be seen?

Genetics: The Study of Biological Information

Mendels Principles of Heredity

Extensions to Mendels Laws

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

Analyzing Genomic Information

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

Filters

Exam 4: The Chromosome Theory of Inheritance

A chromosome with two arms of equal length is referred to as

Which term describes chromosomes where the centromere is located closer to one end of the chromosome?

A variable feature of some chromosomes in corn is the presence or absence of knobs at particular sites.Suppose that one member of each of two pairs of chromosomes in a corn plant has a knob.If this plant is crossed with a knobless plant, what percentage of the offspring is expected to be knobless?

In the following pedigree, the indicated trait is caused by which type of allele?

At which of the following stages of meiosis would homologous chromosomes be paired?

In human oogenesis, how many chromosomes does an ovum carry?

In human oogenesis, how many chromosomes does a secondary oocyte carry?

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?

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

Microtubules that attach to centrosomes but not chromosomes and that interdigitate with microtubules emanating from the centrosome at the opposite pole are known as

Nondisjunction can occur at either the first or second division of meiosis.XYY individuals would most likely arise from nondisjunction at the ______ meiotic division in the ______.

The stage of mitosis when chromosomes condense to form rod-shaped structures visible under the microscope is called

Premeiotic germ cells that divide mitotically in females are referred to as

Cells in the G2 stage of the cell cycle have ______ as cells of the same species in the G1 stage.

If you are a male, your X chromosome contains genes derived from

In which of the following cases will a Barr body be seen?

Genetics: The Study of Biological Information

Mendels Principles of Heredity

Extensions to Mendels Laws

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

Analyzing Genomic Information

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

Filters

Nondisjunction can occur at either the first or second division of meiosis.XYY individuals would most likely arise from nondisjunction at the meiotic division in the .

Cells in the G₂ stage of the cell cycle have ______ as cells of the same species in the G₁ stage.