Question 1

One reason that fertilization rarely occurs between the gametes of two different species might be that the plasma membranes of the gametes of different species do not contain the same ____________________, so the membranes of the sperm and the egg cannot fuse.

Accepted Answer

The answer of One reason that fertilization rarely occurs between...

Question 2

In oogenesis, the final steps of meiosis do not occur until ____________________ takes place.

Accepted Answer

The answer of In oogenesis, the final steps of meiosis...

Question 3

The human embryo develops in a fluid-filled sac called the

Accepted Answer

A)  uterus.
B)  endometrium.
C)  yolk sac.
D)  amnion.

Question 4

Disruptions to the development of a zygote can occur at any time during pregnancy. Among the time periods mentioned below the most vulnerable period of development for a zygote/fetus/embryo would be the

Accepted Answer

A)  first week.
B)  twentieth week.
C)  thirtieth week.
D)  fortieth week.

Question 5

Which of the following does not affect development in animals?

Accepted Answer

A)  morphogens
B)  hemoglobin
C)  genes
D)  hormones

Question 6

Animal sperm cells tend to be larger than animal egg cells.

Accepted Answer

A) True 
 B)False

Question 7

Why is the head of a sperm covered with a sac of enzymes?

Accepted Answer

A)  The enzymes are used to prevent other sperm from entering the egg after the sperm and egg membranes have fused.
B)  The enzymes are needed to digest a hole in the protective "shell" surrounding the egg.
C)  The enzymes are released to kill other sperm so that, by the time sperm reach the egg, only a hundred or so remain to compete with.
D)  The enzymes are gradually released into the sperm, where they break down sugars, releasing the energy needed to power sperm movement.

Question 8

In mammals, the blastocyst consists of the trophoblast and the

Accepted Answer

A)  placenta.
B)  inner cell mass.
C)  zygote.
D)  embryo.

Question 9

Which of the following would not be exchanged between a mother and her fetus through the umbilical cord?

Accepted Answer

A)  enzymes
B)  carbon dioxide
C)  antibodies
D)  oxygen

Question 10

In mammals, the trophoblast layer in a blastocyst will become part of the

Accepted Answer

A)  uterus.
B)  primary oocyte.
C)  oviduct.
D)  placenta.

Question 11

Would the separation of an egg and its polar body soon after fertilization harm the development of an embryo?

Accepted Answer

A)  Yes; the polar body contains genetic information required for the early stages of embryonic development.
B)  Yes; if a polar body is formed, it will develop into the identical twin of the first embryo.
C)  No; fertilization naturally causes the polar body to release from the zygote.
D)  No; because a polar body contains little cytoplasm, it cannot develop into an embryo.

Question 12

Why does an embryo undergo the process of gastrulation?

Accepted Answer

A)  Gastrulation separates the cells of the inner cell mass and the trophoblast so that the trophoblast is free to develop into the placenta.
B)  During gastrulation, the cells of the embryo move around to create the four extraembryonic membranes that protect the membranes.
C)  The rapid cell division that occurs during gastrulation allows the embryo to increase quickly in cell number without using much energy for cell growth.
D)  Cells in the blastocyst differentiate to form embryonic tissues, but are not originally located in the right place. Gastrulation moves these cells to the proper position in the embryo.

Question 13

Once all the organ systems are developed in a human, about 9 weeks after fertilization, the developing child is considered a(n)____________________.

Accepted Answer

The answer of Once all the organ systems are developed...

Question 14

Which of the following could have an effect on the development of a fetus or embryo?

Accepted Answer

A)  alcohol
B)  certain prescription drugs
C)  drug use
D)  all of the above

Question 15

The stage in mammalian development when the embryo exists as a hollow, fluid-filled ball is referred to as the ____________________.

Accepted Answer

The answer of The stage in mammalian development when the...

Question 16

Embryonic stem cells have the greatest potential for creating medical treatments because they

Accepted Answer

A)  contain less DNA than other types of stem cells so they are easier to manipulate.
B)  are more common than other types of stem cells in the bodies of adults.
C)  do not undergo transcription.
D)  can become any type of body cell and, therefore, can be used to treat many different conditions.

Exam 33: Reproduction and Development

In oogenesis, the final steps of meiosis do not occur until ____________________ takes place.

Correct Answer
verified

In mammals, the trophoblast layer in a blastocyst will become part of the

Correct Answer
verified

Which of the following could have an effect on the development of a fetus or embryo?

Correct Answer
verified

In mammals, the blastocyst consists of the trophoblast and the

Correct Answer
verified

The human embryo develops in a fluid-filled sac called the

Correct Answer
verified

Would the separation of an egg and its polar body soon after fertilization harm the development of an embryo?

Correct Answer
verified

One reason that fertilization rarely occurs between the gametes of two different species might be that the plasma membranes of the gametes of different species do not contain the same ____________________, so the membranes of the sperm and the egg cannot fuse.

Correct Answer
verified

Which of the following would not be exchanged between a mother and her fetus through the umbilical cord?

Correct Answer
verified

Why is the head of a sperm covered with a sac of enzymes?

Correct Answer
verified

Once all the organ systems are developed in a human, about 9 weeks after fertilization, the developing child is considered a(n)____________________.

Correct Answer
verified

Why does an embryo undergo the process of gastrulation?

Correct Answer
verified

The stage in mammalian development when the embryo exists as a hollow, fluid-filled ball is referred to as the ____________________.

Correct Answer
verified

Animal sperm cells tend to be larger than animal egg cells.

Correct Answer
verified

Which of the following does not affect development in animals?

Correct Answer
verified

Embryonic stem cells have the greatest potential for creating medical treatments because they

Correct Answer
verified

Disruptions to the development of a zygote can occur at any time during pregnancy. Among the time periods mentioned below the most vulnerable period of development for a zygote/fetus/embryo would be the

Correct Answer
verified

Exam 33: Reproduction and Development

In oogenesis, the final steps of meiosis do not occur until ____________________ takes place.

Correct AnswerverifiedShow Answer

In mammals, the trophoblast layer in a blastocyst will become part of the

Correct AnswerverifiedShow Answer

Which of the following could have an effect on the development of a fetus or embryo?

Correct AnswerverifiedShow Answer

In mammals, the blastocyst consists of the trophoblast and the

Correct AnswerverifiedShow Answer

The human embryo develops in a fluid-filled sac called the

Correct AnswerverifiedShow Answer

Would the separation of an egg and its polar body soon after fertilization harm the development of an embryo?

Correct AnswerverifiedShow Answer

One reason that fertilization rarely occurs between the gametes of two different species might be that the plasma membranes of the gametes of different species do not contain the same ____________________, so the membranes of the sperm and the egg cannot fuse.

Correct AnswerverifiedShow Answer

Which of the following would not be exchanged between a mother and her fetus through the umbilical cord?

Correct AnswerverifiedShow Answer

Why is the head of a sperm covered with a sac of enzymes?

Correct AnswerverifiedShow Answer

Once all the organ systems are developed in a human, about 9 weeks after fertilization, the developing child is considered a(n)____________________.

Correct AnswerverifiedShow Answer

Why does an embryo undergo the process of gastrulation?

Correct AnswerverifiedShow Answer

The stage in mammalian development when the embryo exists as a hollow, fluid-filled ball is referred to as the ____________________.

Correct AnswerverifiedShow Answer

Animal sperm cells tend to be larger than animal egg cells.

Correct AnswerverifiedShow Answer

Which of the following does not affect development in animals?

Correct AnswerverifiedShow Answer

Embryonic stem cells have the greatest potential for creating medical treatments because they

Correct AnswerverifiedShow Answer

Disruptions to the development of a zygote can occur at any time during pregnancy. Among the time periods mentioned below the most vulnerable period of development for a zygote/fetus/embryo would be the

Correct AnswerverifiedShow Answer

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