Question 1

At a cellular level, sexual reproduction involves the fusion of two cells into one. Some biologists have proposed early conditions (such as life in a pool that is drying up) that could have promoted primitive cells trying to engulf members of their own species but they succeeded in only fusing together. That means that the real evolutionary question may be the following: How could these early cells reduce the chromosome number by half? Consider the stages in mitotic division. Which processes in both nuclear replication and division, and cytokinesis, would need to be turned on or turned off in order to move from mitosis to meiosis?

Accepted Answer

In meiosis, during prophase I bivalents ...

Question 2

Identify the chromosomal abnormalities as well as the physical features present in a person suffering from Turner syndrome.

Accepted Answer

An individual who inherits XO will show ...

Question 3

Homologous chromosomes are similar in all of these characteristics EXCEPT

Accepted Answer

A)   similar in size.
B)   carry the same alleles for all traits.
C)   carry genes for the same traits.
D)   similar in shape and location of the centromere.E) C) and D)
F) B) and C)

Question 4

The cell formed through fertilization of an egg by a sperm is called a/an

Accepted Answer

A)   gamete.
B)   sperm cell.
C)   zygote.
D)   egg cell.
E)   ovum.F) A) and E)
G) D) and E)

Question 5

During which phase of mitosis and meiosis will the state of the chromosome be the same?

Accepted Answer

A)   anaphase II and Anaphase
B)   prophase II and Prophase
C)   metaphase I and Metaphase
D)   telophase I and TelophaseE) B) and C)
F) C) and D)

Question 6

Species X reproduces asexually by fission and species Y reproduces sexually. Consider that all other relevant characteristics are similar between these species. When the environment changes, then

Accepted Answer

A)   species X and Y will have an equal chance of surviving.
B)   species Y should have a better chance of surviving than species X.
C)   species X should have a better chance of surviving than species Y.
D)   neither species should have an advantage in surviving since organisms often become extinct when the environment changes.E) B) and D)
F) B) and C)

Question 7

Meiosis occurs during all of the following EXCEPT

Accepted Answer

A)   gametogenesis.
B)   oogenesis.
C)   pangenesis.
D)   spermatogenesis.E) A) and C)
F) A) and B)

Question 8

During _______________ the homologous chromosome pairs separate in a random fashion leading to genetic diversity among the offspring.

Accepted Answer

A)   independent assortment
B)   metaphase
C)   anaphase II
D)   mitosisE) None of the above
F) All of the above

Question 9

The following picture depicts which of the following changes in chromosome structure?

Accepted Answer

A)   deletion
B)   duplication
C)   translocation
D)   aneuploidyE) A) and B)
F) C) and D)

Question 10

There is a species of desert lizard where only females are known to exist-there are no males known. It is nevertheless necessary for two females to court and for one to assume the posture of a male to stimulate the female to produce eggs. No fertilization can occur, and the eggs develop into female lizards. What is the probable evolutionary mechanism for this occurring?

Accepted Answer

A)   The species is probably going extinct.
B)   The desert is relatively uniform and there is little advantage to maintaining variation, but the animal has not been able to completely evolve away from its heritage of sexual reproduction.
C)   This switch in mating behavior is the direct physical reflection of crossing-over.
D)   This is probably an asexual organism attempting to mimic sexual reproduction.E) A) and B)
F) B) and D)

Question 11

In human females, when is meiosis II completed?

Accepted Answer

A)   at ovulation
B)   immediately after the sperm penetration of the secondary oocyte
C)   immediately after the sperm penetrates the primary oocyte
D)   None of the choices are correct.E) B) and D)
F) A) and B)

Question 12

Which of the following events occurs during prophase I but does not occur during prophase of mitosis?

Accepted Answer

A)   crossing over
B)   nuclear envelope dissolves
C)   chromatin condenses into chromosomes
D)   centrioles appear in animal cellsE) B) and C)
F) C) and D)

Question 13

Monosomy occurs when an individual has only one of a particular type of chromosome.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is/are true about sexual reproduction?

Accepted Answer

A)   At the cellular level is the opposite of reproduction since it involves two cells fusing to become one.
B)   It requires the development of organs such as the uterus, which are of no immediate survival advantage to the individual but are advantageous to the species.
C)   It regularly produces a wider array of adaptations to the external environment in a shorter period of time.
D)   It regularly produces a wider array of adaptations to the internal environment (disease agents, parasites)  in a shorter period of time.
E)   All of the choices are true.F) A) and B)
G) A) and C)

Question 15

Which of the following statements is true about the life cycle of animals?

Accepted Answer

A)   The gametes are the haploid phase of the animals life cycle.
B)   The gametes are the diploid phase of the life cycle.
C)   The products of the haploid phase of the life cycle are larger than those of the diploid phase.
D)   Meiosis is not a necessary component of the animal life cycle.E) A) and B)
F) A) and C)

Question 16

Which of the following is NOT a difference between anaphase I and anaphase II?

Accepted Answer

A)   At the end of anaphase I, each chromosome is composed of two chromatids and at the end of anaphase II, sister chromatids have separated, becoming daughter chromosomes
B)   Anaphase I occurs in a haploid cell while anaphase II occurs in a diploid cell.
C)   Sister chromatids separate during anaphase II while homologous chromosomes separate during anaphase I.
D)   The cell undergoing anaphase II is genetically different from what it contained while undergoing anaphase I.E) B) and C)
F) None of the above

Question 17

If gametes had the same number of chromosomes as body cells, and an organism had 12 chromosomes in its body cells, how many chromosomes would it have after three generations? How does this illustrate the necessity of meiosis for gamete formation?

Accepted Answer

The number of chromosomes would double e...

Question 18

Sources of genetic variation in a sexually reproducing population include(s)  which of the following?

Accepted Answer

A)   crossing over in Prophase I of meiosis
B)   independent assortment in Metaphase I of meiosis
C)   fertilization
D)   All of the choices are sources of genetic variation.
E)   None of the choices are sources of genetic variation.F) A) and C)
G) D) and E)

Question 19

The following picture depicts which of the following changes in chromosome structure?

Accepted Answer

A)   deletion
B)   duplication
C)   translocation
D)   aneuploidyE) All of the above
F) A) and B)

Question 20

Which of the following statements is correct about the chromosomal position during mitosis and meiosis?

Accepted Answer

A)   During metaphase of mitosis the duplicated chromosomes are at the metaphase plate while during metaphase I of meiosis the bivalents are present at the metaphase plate.
B)   During metaphase I of meiosis the duplicated chromosomes are at the metaphase plate while during metaphase of mitosis the bivalents are present at the metaphase plate.
C)   During metaphase of mitosis the homologues separate while during metaphase I of meiosis the sister chromatids separate.
D)   During metaphase I of meiosis the homologues separate while during metaphase of mitosis the sister chromatids separate.E) A) and D)
F) All of the above

Exam 10: Meiosis and Sexual Reproduction

Identify the chromosomal abnormalities as well as the physical features present in a person suffering from Turner syndrome.

Correct Answer
verified
An individual who inherits XO will show ...
View Answer

The cell formed through fertilization of an egg by a sperm is called a/an

Correct Answer
verified

Which of the following is/are true about sexual reproduction?

Correct Answer
verified

If gametes had the same number of chromosomes as body cells, and an organism had 12 chromosomes in its body cells, how many chromosomes would it have after three generations? How does this illustrate the necessity of meiosis for gamete formation?

Correct Answer
verified
The number of chromosomes would double e...
View Answer

Correct Answer
verified
In meiosis, during prophase I bivalents ...
View Answer

The following picture depicts which of the following changes in chromosome structure?

Correct Answer
verified

Sources of genetic variation in a sexually reproducing population include(s) which of the following?

Correct Answer
verified

During which phase of mitosis and meiosis will the state of the chromosome be the same?

Correct Answer
verified

During _______________ the homologous chromosome pairs separate in a random fashion leading to genetic diversity among the offspring.

Correct Answer
verified

Which of the following statements is true about the life cycle of animals?

Correct Answer
verified

Which of the following is NOT a difference between anaphase I and anaphase II?

Correct Answer
verified

Species X reproduces asexually by fission and species Y reproduces sexually. Consider that all other relevant characteristics are similar between these species. When the environment changes, then

Correct Answer
verified

In human females, when is meiosis II completed?

Correct Answer
verified

The following picture depicts which of the following changes in chromosome structure?

Correct Answer
verified

Homologous chromosomes are similar in all of these characteristics EXCEPT

Correct Answer
verified

Correct Answer
verified

Monosomy occurs when an individual has only one of a particular type of chromosome.

Correct Answer
verified

Which of the following events occurs during prophase I but does not occur during prophase of mitosis?

Correct Answer
verified

Which of the following statements is correct about the chromosomal position during mitosis and meiosis?

Correct Answer
verified

Meiosis occurs during all of the following EXCEPT

Correct Answer
verified

Exam 10: Meiosis and Sexual Reproduction

Identify the chromosomal abnormalities as well as the physical features present in a person suffering from Turner syndrome.

Correct AnswerverifiedAn individual who inherits XO will show ...View AnswerShow Answer

The cell formed through fertilization of an egg by a sperm is called a/an

Correct AnswerverifiedShow Answer

Which of the following is/are true about sexual reproduction?

Correct AnswerverifiedShow Answer

If gametes had the same number of chromosomes as body cells, and an organism had 12 chromosomes in its body cells, how many chromosomes would it have after three generations? How does this illustrate the necessity of meiosis for gamete formation?

Correct AnswerverifiedThe number of chromosomes would double e...View AnswerShow Answer

Correct AnswerverifiedIn meiosis, during prophase I bivalents ...View AnswerShow Answer

The following picture depicts which of the following changes in chromosome structure?

Correct AnswerverifiedShow Answer

Sources of genetic variation in a sexually reproducing population include(s) which of the following?

Correct AnswerverifiedShow Answer

During which phase of mitosis and meiosis will the state of the chromosome be the same?

Correct AnswerverifiedShow Answer

During _______________ the homologous chromosome pairs separate in a random fashion leading to genetic diversity among the offspring.

Correct AnswerverifiedShow Answer

Which of the following statements is true about the life cycle of animals?

Correct AnswerverifiedShow Answer

Which of the following is NOT a difference between anaphase I and anaphase II?

Correct AnswerverifiedShow Answer

Species X reproduces asexually by fission and species Y reproduces sexually. Consider that all other relevant characteristics are similar between these species. When the environment changes, then

Correct AnswerverifiedShow Answer

In human females, when is meiosis II completed?

Correct AnswerverifiedShow Answer

The following picture depicts which of the following changes in chromosome structure?

Correct AnswerverifiedShow Answer

Homologous chromosomes are similar in all of these characteristics EXCEPT

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Monosomy occurs when an individual has only one of a particular type of chromosome.

Correct AnswerverifiedShow Answer

Which of the following events occurs during prophase I but does not occur during prophase of mitosis?

Correct AnswerverifiedShow Answer

Which of the following statements is correct about the chromosomal position during mitosis and meiosis?

Correct AnswerverifiedShow Answer

Meiosis occurs during all of the following EXCEPT

Correct AnswerverifiedShow Answer

Correct Answer
verified
An individual who inherits XO will show ...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The number of chromosomes would double e...
View Answer

Correct Answer
verified
In meiosis, during prophase I bivalents ...
View Answer

Correct Answer
verified

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Correct Answer
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