Heterochrony is a. the alteration of the spatial pattern of gene expression. b. a change in the relative position of a body part. c. a change in the relative timing of developmental events. d. a change in a signaling pathway.

Question

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Answer 1

Textbook Question

Chapter 25, Problem 1U

Heterochrony is

a. the alteration of the spatial pattern of gene expression.

b. a change in the relative position of a body part.

c. a change in the relative timing of developmental events.

d. a change in a signaling pathway.

Expert Solution & Answer

Summary Introduction

Introduction:

Changes in the development, contribute towards the evolution. The species which are closely related differ from each other because of the genetic changes. These genetic changes lead to differences in their developmental pattern, which result in producing different phenotype. The types of these developmental changes include homeosis and heterochrony.

Answer to Problem 1U

Correct answer:

The alterations in the timing of developmental events due to genetic changes are called heterochrony. Therefore, option c. is correct.

Explanation of Solution

Reason for the correct statement:

When the transcription factors are modified during evolution, they bring changes in the gene function. These changes in genes bring alterations in the timing of developmental events. Such modifications are known as heterochrony.

Option c. is given as "a change in the relative timing of developmental events".

As, “in heterochronic mutations, alterations in the timing of developmental events take place as a result of evolutionary changes in the genes”, is the right answer.

Hence, option c. is correct.

Reasons for the incorrect statements:

Option a. is given as “the alteration of the spatial pattern of gene expression”.

The alterations in the spatial pattern of gene expression, is a type of homeosis. So, it is a wrong answer.

Option b. is given as “a change in the relative position of a body part.”

Change in the relative position of a body part is a type of homeotic mutation, which does not produce a phenotype which is viable. So, it is a wrong answer.

Option d. is given as “a change in the signaling pathway”.

Change in the signaling pathway, results in the appearance of a homeotic phenotype. So, it is a wrong answer.

Hence, options a, b and d are incorrect.

Conclusion

A change in the relative timing of developmental events is known as heterochrony.

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*Example 2: Tracing the path of an autosomal dominant trait Trait: Neurofibromatosis Forms of the trait: The dominant form is neurofibromatosis, caused by the production of an abnormal form of the protein neurofibromin. Affected individuals show spots of abnormal skin pigmentation and non-cancerous tumors that can interfere with the nervous system and cause blindness. Some tumors can convert to a cancerous form. i The recessive form is a normal protein - in other words, no neurofibromatosis.moovi A typical pedigree for a family that carries neurofibromatosis is shown below. Note that carriers are not indicated with half-colored shapes in this chart. Use the letter "N" to indicate the dominant neurofibromatosis allele, and the letter "n" for the normal allele. Nn nn nn 2 nn Nn A 3 N-

Answer 2

Textbook Question

Chapter 25, Problem 1U

Heterochrony is

a. the alteration of the spatial pattern of gene expression.

b. a change in the relative position of a body part.

c. a change in the relative timing of developmental events.

d. a change in a signaling pathway.

Expert Solution & Answer

Summary Introduction

Introduction:

Changes in the development, contribute towards the evolution. The species which are closely related differ from each other because of the genetic changes. These genetic changes lead to differences in their developmental pattern, which result in producing different phenotype. The types of these developmental changes include homeosis and heterochrony.

Answer to Problem 1U

Correct answer:

The alterations in the timing of developmental events due to genetic changes are called heterochrony. Therefore, option c. is correct.

Explanation of Solution

Reason for the correct statement:

When the transcription factors are modified during evolution, they bring changes in the gene function. These changes in genes bring alterations in the timing of developmental events. Such modifications are known as heterochrony.

Option c. is given as "a change in the relative timing of developmental events".

As, “in heterochronic mutations, alterations in the timing of developmental events take place as a result of evolutionary changes in the genes”, is the right answer.

Hence, option c. is correct.

Reasons for the incorrect statements:

Option a. is given as “the alteration of the spatial pattern of gene expression”.

The alterations in the spatial pattern of gene expression, is a type of homeosis. So, it is a wrong answer.

Option b. is given as “a change in the relative position of a body part.”

Change in the relative position of a body part is a type of homeotic mutation, which does not produce a phenotype which is viable. So, it is a wrong answer.

Option d. is given as “a change in the signaling pathway”.

Change in the signaling pathway, results in the appearance of a homeotic phenotype. So, it is a wrong answer.

Hence, options a, b and d are incorrect.

Conclusion

A change in the relative timing of developmental events is known as heterochrony.

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Answer 3

Textbook Question

Chapter 25, Problem 1U

Heterochrony is

a. the alteration of the spatial pattern of gene expression.

b. a change in the relative position of a body part.

c. a change in the relative timing of developmental events.

d. a change in a signaling pathway.

Expert Solution & Answer

Summary Introduction

Introduction:

Changes in the development, contribute towards the evolution. The species which are closely related differ from each other because of the genetic changes. These genetic changes lead to differences in their developmental pattern, which result in producing different phenotype. The types of these developmental changes include homeosis and heterochrony.

Answer to Problem 1U

Correct answer:

The alterations in the timing of developmental events due to genetic changes are called heterochrony. Therefore, option c. is correct.

Explanation of Solution

Reason for the correct statement:

When the transcription factors are modified during evolution, they bring changes in the gene function. These changes in genes bring alterations in the timing of developmental events. Such modifications are known as heterochrony.

Option c. is given as "a change in the relative timing of developmental events".

As, “in heterochronic mutations, alterations in the timing of developmental events take place as a result of evolutionary changes in the genes”, is the right answer.

Hence, option c. is correct.

Reasons for the incorrect statements:

Option a. is given as “the alteration of the spatial pattern of gene expression”.

The alterations in the spatial pattern of gene expression, is a type of homeosis. So, it is a wrong answer.

Option b. is given as “a change in the relative position of a body part.”

Change in the relative position of a body part is a type of homeotic mutation, which does not produce a phenotype which is viable. So, it is a wrong answer.

Option d. is given as “a change in the signaling pathway”.

Change in the signaling pathway, results in the appearance of a homeotic phenotype. So, it is a wrong answer.

Hence, options a, b and d are incorrect.

Conclusion

A change in the relative timing of developmental events is known as heterochrony.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Textbook Question

Chapter 25, Problem 1U

Heterochrony is

a. the alteration of the spatial pattern of gene expression.

b. a change in the relative position of a body part.

c. a change in the relative timing of developmental events.

d. a change in a signaling pathway.

Expert Solution & Answer

Summary Introduction

Introduction:

Changes in the development, contribute towards the evolution. The species which are closely related differ from each other because of the genetic changes. These genetic changes lead to differences in their developmental pattern, which result in producing different phenotype. The types of these developmental changes include homeosis and heterochrony.

Answer to Problem 1U

Correct answer:

The alterations in the timing of developmental events due to genetic changes are called heterochrony. Therefore, option c. is correct.

Explanation of Solution

Reason for the correct statement:

When the transcription factors are modified during evolution, they bring changes in the gene function. These changes in genes bring alterations in the timing of developmental events. Such modifications are known as heterochrony.

Option c. is given as "a change in the relative timing of developmental events".

As, “in heterochronic mutations, alterations in the timing of developmental events take place as a result of evolutionary changes in the genes”, is the right answer.

Hence, option c. is correct.

Reasons for the incorrect statements:

Option a. is given as “the alteration of the spatial pattern of gene expression”.

The alterations in the spatial pattern of gene expression, is a type of homeosis. So, it is a wrong answer.

Option b. is given as “a change in the relative position of a body part.”

Change in the relative position of a body part is a type of homeotic mutation, which does not produce a phenotype which is viable. So, it is a wrong answer.

Option d. is given as “a change in the signaling pathway”.

Change in the signaling pathway, results in the appearance of a homeotic phenotype. So, it is a wrong answer.

Hence, options a, b and d are incorrect.

Conclusion

A change in the relative timing of developmental events is known as heterochrony.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Textbook Question

Answer 6

Textbook Question

Answer 7

Expert Solution & Answer

Summary Introduction

Introduction:

Changes in the development, contribute towards the evolution. The species which are closely related differ from each other because of the genetic changes. These genetic changes lead to differences in their developmental pattern, which result in producing different phenotype. The types of these developmental changes include homeosis and heterochrony.

Answer to Problem 1U

Correct answer:

The alterations in the timing of developmental events due to genetic changes are called heterochrony. Therefore, option c. is correct.

Explanation of Solution

Reason for the correct statement:

When the transcription factors are modified during evolution, they bring changes in the gene function. These changes in genes bring alterations in the timing of developmental events. Such modifications are known as heterochrony.

Option c. is given as "a change in the relative timing of developmental events".

As, “in heterochronic mutations, alterations in the timing of developmental events take place as a result of evolutionary changes in the genes”, is the right answer.

Hence, option c. is correct.

Reasons for the incorrect statements:

Option a. is given as “the alteration of the spatial pattern of gene expression”.

The alterations in the spatial pattern of gene expression, is a type of homeosis. So, it is a wrong answer.

Option b. is given as “a change in the relative position of a body part.”

Change in the relative position of a body part is a type of homeotic mutation, which does not produce a phenotype which is viable. So, it is a wrong answer.

Option d. is given as “a change in the signaling pathway”.

Change in the signaling pathway, results in the appearance of a homeotic phenotype. So, it is a wrong answer.

Hence, options a, b and d are incorrect.

Conclusion

A change in the relative timing of developmental events is known as heterochrony.

Answer 8

Expert Solution & Answer

Summary Introduction

Introduction:

Changes in the development, contribute towards the evolution. The species which are closely related differ from each other because of the genetic changes. These genetic changes lead to differences in their developmental pattern, which result in producing different phenotype. The types of these developmental changes include homeosis and heterochrony.

Answer to Problem 1U

Correct answer:

The alterations in the timing of developmental events due to genetic changes are called heterochrony. Therefore, option c. is correct.

Explanation of Solution

Reason for the correct statement:

When the transcription factors are modified during evolution, they bring changes in the gene function. These changes in genes bring alterations in the timing of developmental events. Such modifications are known as heterochrony.

Option c. is given as "a change in the relative timing of developmental events".

As, “in heterochronic mutations, alterations in the timing of developmental events take place as a result of evolutionary changes in the genes”, is the right answer.

Hence, option c. is correct.

Reasons for the incorrect statements:

Option a. is given as “the alteration of the spatial pattern of gene expression”.

The alterations in the spatial pattern of gene expression, is a type of homeosis. So, it is a wrong answer.

Option b. is given as “a change in the relative position of a body part.”

Change in the relative position of a body part is a type of homeotic mutation, which does not produce a phenotype which is viable. So, it is a wrong answer.

Option d. is given as “a change in the signaling pathway”.

Change in the signaling pathway, results in the appearance of a homeotic phenotype. So, it is a wrong answer.

Hence, options a, b and d are incorrect.

Conclusion

A change in the relative timing of developmental events is known as heterochrony.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Summary Introduction

Introduction:

Changes in the development, contribute towards the evolution. The species which are closely related differ from each other because of the genetic changes. These genetic changes lead to differences in their developmental pattern, which result in producing different phenotype. The types of these developmental changes include homeosis and heterochrony.

Answer 12

Answer to Problem 1U

Correct answer:

The alterations in the timing of developmental events due to genetic changes are called heterochrony. Therefore, option c. is correct.

Answer 13

Explanation of Solution

Reason for the correct statement:

When the transcription factors are modified during evolution, they bring changes in the gene function. These changes in genes bring alterations in the timing of developmental events. Such modifications are known as heterochrony.

Option c. is given as "a change in the relative timing of developmental events".

As, “in heterochronic mutations, alterations in the timing of developmental events take place as a result of evolutionary changes in the genes”, is the right answer.

Hence, option c. is correct.

Reasons for the incorrect statements:

Option a. is given as “the alteration of the spatial pattern of gene expression”.

The alterations in the spatial pattern of gene expression, is a type of homeosis. So, it is a wrong answer.

Option b. is given as “a change in the relative position of a body part.”

Change in the relative position of a body part is a type of homeotic mutation, which does not produce a phenotype which is viable. So, it is a wrong answer.

Option d. is given as “a change in the signaling pathway”.

Change in the signaling pathway, results in the appearance of a homeotic phenotype. So, it is a wrong answer.

Hence, options a, b and d are incorrect.