Question 1

As cleavage continues during frog development, the size of the blastomeres

Accepted Answer

A)  increases as the number of the blastomeres decreases.
B)  increases as the number of the blastomeres increases.
C)  decreases as the number of the blastomeres increases.
D)  decreases as the number of the blastomeres decreases.
E)  increases as the number of the blastomeres stays the same.F) None of the above
G) A) and B)

Question 2

The earliest developmental stage among these choices is

Accepted Answer

A)  germ layers.
B)  morula.
C)  blastopore.
D)  gastrulation.
E)  invagination.F) B) and C)
G) C) and D)

Question 3

Contact of an egg with signal molecules on sperm causes the egg to undergo a brief

Accepted Answer

A)  mitosis.
B)  membrane depolarization.
C)  apoptosis.
D)  vitellogenesis.
E)  the acrosomal reaction.F) B) and E)
G) A) and E)

Question 4

If gastrulation was blocked by an environmental toxin, then

Accepted Answer

A)  cleavage would not occur in the zygote.
B)  embryonic germ layers would not form.
C)  fertilization would be blocked.
D)  the blastula would not be formed.
E)  the blastopore would form above the gray crescent in the animal pole.F) A) and D)
G) B) and D)

Question 5

Use the following information to answer the following questions.
In a study of the development of frog embryos, several early gastrulas were stained with vital dyes. The locations of the dyes after gastrulation were noted. The results are shown in the following table.
   Tissue  Stain  Brain  red  Notochord  yellow  Liver  green  Lens of the eye  blue  Lining of the digestive tract  purple \begin{array} { l l } 	ext { Tissue } & 	ext { Stain } \\hline 	ext { Brain } & 	ext { red } \	ext { Notochord } & 	ext { yellow } \	ext { Liver } & 	ext { green } \	ext { Lens of the eye } & 	ext { blue } \	ext { Lining of the digestive tract } & 	ext { purple }\end{array} Tissue  Brain  Notochord  Liver  Lens of the eye  Lining of the digestive tract ​ Stain  red  yellow  green  blue  purple ​​  
Figure 47.1
-The mesoderm was probably stained with a

Accepted Answer

A)  blue color.
B)  yellow color.
C)  red color.
D)  purple color.
E)  green color. F) B) and C)
G) A) and E)

Question 6

From earliest to latest, the overall sequence of early development proceeds as follows:

Accepted Answer

A)  gastrulation → organogenesis → cleavage
B)  ovulation → gastrulation → fertilization
C)  cleavage → gastrulation → organogenesis
D)  gastrulation → blastulation → neurulation
E)  preformation → morphogenesis → neurulationF) A) and D)
G) A) and C)

Question 7

From earliest to latest, the overall sequence of early development proceeds as follows:

Accepted Answer

A)  first cell division → synthesis of embryo's DNa begins → acrosomal reaction → cortical reaction
B)  cortical reaction → synthesis of embryo's DNA begins → acrosomal reaction → first cell division
C)  cortical reaction → acrosomal reaction → first cell division → synthesis of embryo's DNA begins
D)  first cell division → synthesis of embryo's DNA begins → acrosomal reaction → cortical reaction
E)  acrosomal reaction → cortical reaction → synthesis of embryo's DNA begins → first cell divisionF) C) and D)
G) A) and E)

Question 8

Cells move to new positions as an embryo establishes its three germ tissue layers during

Accepted Answer

A)  determination.
B)  cleavage.
C)  fertilization.
D)  induction.
E)  gastrulation.F) B) and C)
G) C) and D)

Question 9

Contact of a sperm with signal molecules in the coat of an egg causes the sperm to undergo

Accepted Answer

A)  mitosis.
B)  depolarization.
C)  apoptosis.
D)  vitellogenesis.
E)  the acrosomal reaction.F) A) and D)
G) A) and E)

Question 10

You buy a pie that contains a swirled mixture of chocolate and vanilla filling. When you cut the pie up, you notice that some slices have more chocolate than vanilla and that other slices have more vanilla than chocolate. This uneven distribution of chocolate and vanilla is most like the uneven distribution of

Accepted Answer

A)  nuclei in a zygote.
B)  nuclei in an early embryo.
C)  nuclei in an egg.
D)  cytoplasmic determinants in a zygote.
E)  cytoplasmic determinants in an early embryo.F) C) and D)
G) A) and B)

Question 11

Fertilization normally

Accepted Answer

A)  reinstates diploidy.
B)  follows gastrulation.
C)  is required for parthenogenesis.
D)  merges two dipoloid cells into one haploid cell.
E)  precedes ovulation.F) None of the above
G) A) and B)

Question 12

The sequence of developmental milestones proceeds as follows:

Accepted Answer

A)  cleavage → blastula → gastrula → morula
B)  cleavage → gastrula → morula → blastula
C)  cleavage → morula → blastula → gastrula
D)  gastrula → morula → blastula → cleavage
E)  morula → cleavage → gastrula → blastulaF) D) and E)
G) C) and D)

Question 13

In humans, identical twins are possible because

Accepted Answer

A)  of the heterogeneous distribution of cytoplasmic determinants in unfertilized eggs.
B)  of interactions between extraembryonic cells and the zygote nucleus.
C)  of convergent extension.
D)  early blastomeres can form a complete embryo if isolated.
E)  the gray crescent divides the dorsal-ventral axis into new cells.F) B) and D)
G) D) and E)

Question 14

The cortical reaction functions directly in the

Accepted Answer

A)  formation of a fertilization envelope.
B)  production of a fast block to polyspermy.
C)  release of hydrolytic enzymes from the sperm cell.
D)  generation of a nerve-like impulse by the egg cell.
E)  fusion of egg and sperm nuclei.F) A) and B)
G) A) and E)

Question 15

In all vertebrate animals, development requires

Accepted Answer

A)  a large supply of yolk.
B)  an aqueous environment.
C)  extraembryonic membranes.
D)  an amnion.
E)  a primitive streak.F) A) and D)
G) A) and C)

Exam 47: Animal Development

Correct Answer
verified

The earliest developmental stage among these choices is

Correct Answer
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Correct Answer
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Fertilization normally

Correct Answer
verified

Contact of an egg with signal molecules on sperm causes the egg to undergo a brief

Correct Answer
verified

Contact of a sperm with signal molecules in the coat of an egg causes the sperm to undergo

Correct Answer
verified

From earliest to latest, the overall sequence of early development proceeds as follows:

Correct Answer
verified

Cells move to new positions as an embryo establishes its three germ tissue layers during

Correct Answer
verified

The sequence of developmental milestones proceeds as follows:

Correct Answer
verified

The cortical reaction functions directly in the

Correct Answer
verified

In all vertebrate animals, development requires

Correct Answer
verified

As cleavage continues during frog development, the size of the blastomeres

Correct Answer
verified

From earliest to latest, the overall sequence of early development proceeds as follows:

Correct Answer
verified

In humans, identical twins are possible because

Correct Answer
verified

If gastrulation was blocked by an environmental toxin, then

Correct Answer
verified

Exam 47: Animal Development

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The earliest developmental stage among these choices is

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Correct AnswerverifiedShow Answer

Fertilization normally

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Contact of an egg with signal molecules on sperm causes the egg to undergo a brief

Correct AnswerverifiedShow Answer

Contact of a sperm with signal molecules in the coat of an egg causes the sperm to undergo

Correct AnswerverifiedShow Answer

From earliest to latest, the overall sequence of early development proceeds as follows:

Correct AnswerverifiedShow Answer

Cells move to new positions as an embryo establishes its three germ tissue layers during

Correct AnswerverifiedShow Answer

The sequence of developmental milestones proceeds as follows:

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The cortical reaction functions directly in the

Correct AnswerverifiedShow Answer

In all vertebrate animals, development requires

Correct AnswerverifiedShow Answer

As cleavage continues during frog development, the size of the blastomeres

Correct AnswerverifiedShow Answer

From earliest to latest, the overall sequence of early development proceeds as follows:

Correct AnswerverifiedShow Answer

In humans, identical twins are possible because

Correct AnswerverifiedShow Answer

If gastrulation was blocked by an environmental toxin, then

Correct AnswerverifiedShow Answer

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verified

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