Question 1

Once all the organ systems are developed in a human, about nine weeks after fertilization, the developing child is considered a_______.

Accepted Answer

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

Question 2

In fruit flies, morphogens

Accepted Answer

A)  are composed of nucleic acids. 
B)  switch genes on and off. 
C)  are receptor proteins. 
D)  exist only in the eggs. 
A)  are composed of nucleic acids. 
B)  switch genes on and off. 
C)  are receptor proteins. 
D)  exist only in the eggs.

Question 3

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 to release from the zygote 
D)  No; the polar body is essentially a trash can. Excess DNA is placed there, but since it contains little cytoplasm it cannot develop into an embryo. 
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 to release from the zygote 
D)  No; the polar body is essentially a trash can. Excess DNA is placed there, but since it contains little cytoplasm it cannot develop into an embryo.

Question 4

In humans, the exchanges of materials between the embryo and its mother occur through the

Accepted Answer

A)  umbilical cord. 
B)  amnion. 
C)  yolk sac. 
D)  endometrium. 
A)  umbilical cord. 
B)  amnion. 
C)  yolk sac. 
D)  endometrium.

Question 5

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

Question 6

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. 
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 7

The shape of the beak of a hummingbird (very long and skinny) and that of a finch (short and fat) is controlled by the same set of genes. Which of the following could account for the differences between these two bird beaks?

Accepted Answer

A)  Apoptosis occurs in the beak of the finch, but not in the beak of the humming bird. 
B)  Although development is controlled by the same genes, the genes produce different proteins and those proteins cause development to occur in different ways. 
C)  The hummingbird retains stem cells for a longer period of time during development than does the finch. 
D)  The genes involved in determining beak shape stay on for different lengths of time in each bird. 
A)  Apoptosis occurs in the beak of the finch, but not in the beak of the humming bird. 
B)  Although development is controlled by the same genes, the genes produce different proteins and those proteins cause development to occur in different ways. 
C)  The hummingbird retains stem cells for a longer period of time during development than does the finch. 
D)  The genes involved in determining beak shape stay on for different lengths of time in each bird.

Question 8

Which of the following statements about hermaphrodites is true?

Accepted Answer

A)  Hermaphrodites can mate with every individual of the same species that they encounter. 
B)  Hermaphrodites can generally fertilize their own eggs. 
C)  Hermaphrodites have either testes or ovaries. 
D)  Few animal phyla include hermaphroditic species. 
A)  Hermaphrodites can mate with every individual of the same species that they encounter. 
B)  Hermaphrodites can generally fertilize their own eggs. 
C)  Hermaphrodites have either testes or ovaries. 
D)  Few animal phyla include hermaphroditic species.

Exam 29: Reproduction and Development

Once all the organ systems are developed in a human, about nine weeks after fertilization, the developing child is considered a_______.

In fruit flies, morphogens

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

In humans, the exchanges of materials between the embryo and its mother occur through the

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

Why does an embryo undergo the process of gastrulation?

The shape of the beak of a hummingbird (very long and skinny) and that of a finch (short and fat) is controlled by the same set of genes. Which of the following could account for the differences between these two bird beaks?

Which of the following statements about hermaphrodites is true?

The Nature of Science and the Characteristics of Life

Organizing the Diversity of Life

Major Groups of Living Organisms

Chemical Building Blocks

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Cell Division

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Chromosomes and Human Genetics

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Control of Gene Expression

DNA Technology

How Evolution Works

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Cancer: Cell Division Out of Control

Harnessing the Human Genome

Humans and Evolution

Smoking--Beyond Lung Cancer

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