Question 1

The haploid number of an organism is 20.A somatic cell from this organism has ________ chromosomes,and its gametes have ________ chromosomes.

Accepted Answer

The answer of The haploid number of an organism is...

Question 2

Which of the following is true about both sperm and egg production?

Accepted Answer

A) Initiation of meiosis is continuous after puberty. 
B) All cells that result from meiosis function as gametes. 
C) All resulting gametes are the same size. 
D) Millions of mature gametes are produced daily. 
E) All resulting gametes are haploid. 
A) Initiation of meiosis is continuous after puberty. 
B) All cells that result from meiosis function as gametes. 
C) All resulting gametes are the same size. 
D) Millions of mature gametes are produced daily. 
E) All resulting gametes are haploid.

Question 3

In a human zygote,where did most of the cytoplasm come from?

Accepted Answer

A) sperm 
B) oocyte 
C) spermatogonia 
D) polar bodies 
A) sperm 
B) oocyte 
C) spermatogonia 
D) polar bodies

Question 4

At the end of meiosis I,each of the sister chromatids is considered a full-fledged chromosome.

Accepted Answer

A) True 
 B)False

Question 5

What is the result of recombination (crossing over)during meiosis?

Accepted Answer

A) It ensures retention of genetic information and helps to preserve cell characteristics. 
B) It binds homologous chromosomes tightly, so they do not accidentally separate. 
C) It eliminates unused genes by removing them. 
D) It allows the cell to complete DNA replication. 
E) It creates chromosomes that are a new combination of paternal and maternal material. 
A) It ensures retention of genetic information and helps to preserve cell characteristics. 
B) It binds homologous chromosomes tightly, so they do not accidentally separate. 
C) It eliminates unused genes by removing them. 
D) It allows the cell to complete DNA replication. 
E) It creates chromosomes that are a new combination of paternal and maternal material.

Question 6

Crossing over occurs during which stage of meiosis?

Accepted Answer

A) telophase I 
B) metaphase II 
C) anaphase II 
D) prophase II 
E) prophase I 
A) telophase I 
B) metaphase II 
C) anaphase II 
D) prophase II 
E) prophase I

Question 7

What would the consequence be if spermatogonia were not stem cells?

Accepted Answer

A) Only a limited quantity of sperm could be produced by males, and then no more could be produced. 
B) Sperm would be diploid rather than haploid. 
C) Sperm would have to be produced by mitosis instead of meiosis. 
D) Mature spermatids would make more sperm by meiosis. 
A) Only a limited quantity of sperm could be produced by males, and then no more could be produced. 
B) Sperm would be diploid rather than haploid. 
C) Sperm would have to be produced by mitosis instead of meiosis. 
D) Mature spermatids would make more sperm by meiosis.

Question 8

At what two stages in the human life cycle are diploid cells found?

Accepted Answer

A) in adult humans and as the zygote 
B) as the zygote and in the sperm and eggs 
C) in gametes and in sperm and eggs 
D) in adult humans and in sperm and eggs 
E) in gametes and as the zygote 
A) in adult humans and as the zygote 
B) as the zygote and in the sperm and eggs 
C) in gametes and in sperm and eggs 
D) in adult humans and in sperm and eggs 
E) in gametes and as the zygote

Question 9

Spermatogonia are called stem cells because they develop into two different types of cells.What are they?

Accepted Answer

A) primary spermatocytes and sperm 
B) more spermatogonia and primary spermatocytes 
C) polar bodies and oocytes 
D) more spermatogonia and oocytes 
E) polar bodies and sperm 
A) primary spermatocytes and sperm 
B) more spermatogonia and primary spermatocytes 
C) polar bodies and oocytes 
D) more spermatogonia and oocytes 
E) polar bodies and sperm

Question 10

If a 2n cell has three chromosome pairs,how many different combinations of chromosomes are possible in gametes after meiosis?

Accepted Answer

A) 16 
B) 32 
C) 8 
D) 64 
E) 36 
A) 16 
B) 32 
C) 8 
D) 64 
E) 36

Question 11

A cell contains eight chromosomes at the end of prophase I.How many chromosomes will be in each daughter cell at the end of prophase II?

Accepted Answer

A) 4 
B) 8 
C) 16 
D) 32 
A) 4 
B) 8 
C) 16 
D) 32

Question 12

Imagine you start a population of 1 million bacteria from a single bacterial cell.Now imagine that a population this large is started from a male and female housefly.How would these two populations differ?

Accepted Answer

A) The cells of the bacterial population would be larger on average than the cells that make up the houseflies. 
B) Individuals of the housefly population would differ genetically from each other much more than would cells of the bacterial population. 
C) No cells of the housefly population would ever divide by meiosis, but some cells of the bacterial population would divide by meiosis. 
D) The cells of the bacterial population would differ genetically from each other much more than would individuals of the housefly population. 
E) No cells of the bacterial population would ever divide by binary fission, but some cells of the housefly population would divide by binary fission. 
A) The cells of the bacterial population would be larger on average than the cells that make up the houseflies. 
B) Individuals of the housefly population would differ genetically from each other much more than would cells of the bacterial population. 
C) No cells of the housefly population would ever divide by meiosis, but some cells of the bacterial population would divide by meiosis. 
D) The cells of the bacterial population would differ genetically from each other much more than would individuals of the housefly population. 
E) No cells of the bacterial population would ever divide by binary fission, but some cells of the housefly population would divide by binary fission.

Question 13

What is the fate of sperm that are never released?

Accepted Answer

A) They are stored indefinitely. 
B) Their cell cycles are stopped in meiosis I. 
C) They continue dividing by mitosis to produce more mature sperm. 
D) They are destroyed by the body's immune system. 
E) They combine to make diploid spermatogonia. 
A) They are stored indefinitely. 
B) Their cell cycles are stopped in meiosis I. 
C) They continue dividing by mitosis to produce more mature sperm. 
D) They are destroyed by the body's immune system. 
E) They combine to make diploid spermatogonia.

Question 14

In meiosis,X and Y chromosomes will pair as homologous chromosomes,but they will recombine only in a few limited regions,at the ends.Explain why recombination is limited in this situation.

Accepted Answer

The X and Y chromosomes contai

Question 15

The X and Y chromosomes are not homologous,but in the meiosis of sperm formation,they pair and separate in anaphase I as though they were homologous.

Accepted Answer

A) True 
 B)False

Question 16

Describe how sperm and egg cells are different from somatic cells in number of chromosomes (in humans),the cell division processes they undergo and the process that generates them,and the process they undergo to generate a zygote.

Accepted Answer

Sperm and egg cells have 23 chromosomes

Question 17

What process produces genetic diversity through random distribution of chromosomes?

Accepted Answer

A) alignment of the metaphase plate to one side instead of in the middle 
B) cytokinesis 
C) independent assortment 
D) recombination 
E) crossing over 
A) alignment of the metaphase plate to one side instead of in the middle 
B) cytokinesis 
C) independent assortment 
D) recombination 
E) crossing over

Question 18

Meiosis II is essentially the same as mitosis except that the outcome produces cells that are:

Accepted Answer

A) diploid. 
B) somatic. 
C) autosomal. 
D) genetically identical to each other. 
E) haploid. 
A) diploid. 
B) somatic. 
C) autosomal. 
D) genetically identical to each other. 
E) haploid.

Question 19

In metaphase I ________ are aligned along the metaphase plate,and in metaphase II ________ are aligned along the metaphase plate.

Accepted Answer

A) pairs of sister chromatids; homologous chromosomes 
B) maternal chromosomes; paternal chromosomes 
C) homologous chromosomes; tetrads 
D) homologous chromosomes; pairs of sister chromatids 
A) pairs of sister chromatids; homologous chromosomes 
B) maternal chromosomes; paternal chromosomes 
C) homologous chromosomes; tetrads 
D) homologous chromosomes; pairs of sister chromatids

Question 20

If an egg is fertilized by a sperm carrying an X chromosome,the resulting child might be either a boy or a girl,depending on the sex chromosome carried by the egg.

Accepted Answer

A) True 
 B)False

Exam 10: Preparing for Sexual Reproduction: Meiosis

The haploid number of an organism is 20.A somatic cell from this organism has ________ chromosomes,and its gametes have ________ chromosomes.

Which of the following is true about both sperm and egg production?

In a human zygote,where did most of the cytoplasm come from?

At the end of meiosis I,each of the sister chromatids is considered a full-fledged chromosome.

What is the result of recombination (crossing over)during meiosis?

Crossing over occurs during which stage of meiosis?

What would the consequence be if spermatogonia were not stem cells?

At what two stages in the human life cycle are diploid cells found?

Spermatogonia are called stem cells because they develop into two different types of cells.What are they?

If a 2n cell has three chromosome pairs,how many different combinations of chromosomes are possible in gametes after meiosis?

A cell contains eight chromosomes at the end of prophase I.How many chromosomes will be in each daughter cell at the end of prophase II?

Imagine you start a population of 1 million bacteria from a single bacterial cell.Now imagine that a population this large is started from a male and female housefly.How would these two populations differ?

What is the fate of sperm that are never released?

In meiosis,X and Y chromosomes will pair as homologous chromosomes,but they will recombine only in a few limited regions,at the ends.Explain why recombination is limited in this situation.

The X and Y chromosomes are not homologous,but in the meiosis of sperm formation,they pair and separate in anaphase I as though they were homologous.

Describe how sperm and egg cells are different from somatic cells in number of chromosomes (in humans),the cell division processes they undergo and the process that generates them,and the process they undergo to generate a zygote.

What process produces genetic diversity through random distribution of chromosomes?

Meiosis II is essentially the same as mitosis except that the outcome produces cells that are:

In metaphase I ________ are aligned along the metaphase plate,and in metaphase II ________ are aligned along the metaphase plate.

If an egg is fertilized by a sperm carrying an X chromosome,the resulting child might be either a boy or a girl,depending on the sex chromosome carried by the egg.

Science As a Way of Learning: a Guide to the Natural World

Fundamental Building Blocks: Chemistry, water, and Ph

Lifes Components: Biological Molecules

Lifes Home: the Cell

Lifes Border: the Plasma Membrane

Lifes Mainspring: an Introduction to Energy

Vital Harvest: Deriving Energy From Food

The Green Worlds Gift: Photosynthesis

The Links in Lifes Chain: Genetics and Cell Division

The First Geneticist: Mendel and His Discoveries

Units of Heredity: Chromosomes and Inheritance

Passing on Lifes Information: Dna Structure and Replication

How Proteins Are Made: Genetic Transcription, translation, and Regulation

The Future Isnt What It Used to Be: Biotechnology

An Introduction to Evolution: Charles Darwin, evolutionary Thought, and the Evidence for Evolution

The Means of Evolution: Microevolution

The Outcomes of Evolution: Macroevolution

A Slow Unfolding: the History of Life on Earth

Arriving Late,traveling Far: the Evolution of Human Beings

Viruses,bacteria,archaea,and Protists: the Diversity of Life 1

Fungi: the Diversity of Life 2

Animals: the Diversity of Life 3

Plants: the Diversity of Life 4

The Angiosperms: Form and Function in Flowering Plants

Body Support and Movement: the Integumentary, skeletal, and Muscular Systems

Communication and Control 1: the Nervous System

Communication and Control 2: the Endocrine System

Defending the Body: the Immune System

Transport and Exchange 1: Blood and Breath

Transport and Exchange 2: Digestion, nutrition, and Elimination

An Amazingly Detailed Script: Animal Development

How the Baby Came to Be: Human Reproduction

An Interactive Living World 1: Populations in Ecology

An Interactive Living World 2: Communities in Ecology

An Interactive Living World 3: Ecosystems and Biomes

Filters

The haploid number of an organism is 20.A somatic cell from this organism has chromosomes,and its gametes have chromosomes.

In metaphase I are aligned along the metaphase plate,and in metaphase II are aligned along the metaphase plate.