a. To describe: The epistasis relationship between sev - and yan- mutants. Introduction: It is given that the yan gene codes for a transcription factor. This transcription factor reduces R7 development in the five cells. These cells express Sevenless and are competent to become R7.

Question

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Answer 1

Question

Chapter 18, Problem 19P

Summary Introduction

a.

To describe:

The epistasis relationship between sev^- and yan- mutants.

Introduction:

It is given that the yan gene codes for a transcription factor. This transcription factor reduces R7 development in the five cells. These cells express Sevenless and are competent to become R7.

Summary Introduction

b.

To determine:

Whether the given proteins show an expected epistatic interaction.

Introduction:

Sevenless and Yan proteins both play a significant role in the signaling pathway. They function during speciation of R7 cells in the development of the embryonic eye.

Summary Introduction

c.

To determine:

The method due to which two different null mutations in the R7 signaling pathway can evoke different mutant phenotypes.

Introduction:

When the phenotype of one gene depends on the presence of one or more modifier genes, this phenomenon is termed as epistasis. Null mutation makes a gene completely non-functional.

Summary Introduction

d.

To determine:

The reason due to which both Ras and Yan function downstream of Sevenless in the signaling pathway.

Introduction:

The epistasis of two genes that function in the same pathway relies on their order of action in the pathway. In the epistatic mutation, either the upstream gene products activate downstream gene products, or they reduce downstream gene products.

Summary Introduction

e.

To determine:

The mutant phenotype of the flies in the given question and whether yan^Dis expected to be epistatic to sev^- or Ras^g12V.

Introduction:

It is given that a researcher identifies flies with a constitutively active mutant allele of yan (yan^D) that is dominant. It expresses yan even in cells when the Sevenless pathway is in active state.

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Answer 2

Question

Chapter 18, Problem 19P

Summary Introduction

a.

To describe:

The epistasis relationship between sev^- and yan- mutants.

Introduction:

It is given that the yan gene codes for a transcription factor. This transcription factor reduces R7 development in the five cells. These cells express Sevenless and are competent to become R7.

Summary Introduction

b.

To determine:

Whether the given proteins show an expected epistatic interaction.

Introduction:

Sevenless and Yan proteins both play a significant role in the signaling pathway. They function during speciation of R7 cells in the development of the embryonic eye.

Summary Introduction

c.

To determine:

The method due to which two different null mutations in the R7 signaling pathway can evoke different mutant phenotypes.

Introduction:

When the phenotype of one gene depends on the presence of one or more modifier genes, this phenomenon is termed as epistasis. Null mutation makes a gene completely non-functional.

Summary Introduction

d.

To determine:

The reason due to which both Ras and Yan function downstream of Sevenless in the signaling pathway.

Introduction:

The epistasis of two genes that function in the same pathway relies on their order of action in the pathway. In the epistatic mutation, either the upstream gene products activate downstream gene products, or they reduce downstream gene products.

Summary Introduction

e.

To determine:

The mutant phenotype of the flies in the given question and whether yan^Dis expected to be epistatic to sev^- or Ras^g12V.

Introduction:

It is given that a researcher identifies flies with a constitutively active mutant allele of yan (yan^D) that is dominant. It expresses yan even in cells when the Sevenless pathway is in active state.

Expert Solution & Answer

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Answer 3

Question

Chapter 18, Problem 19P

Summary Introduction

a.

To describe:

The epistasis relationship between sev^- and yan- mutants.

Introduction:

It is given that the yan gene codes for a transcription factor. This transcription factor reduces R7 development in the five cells. These cells express Sevenless and are competent to become R7.

Summary Introduction

b.

To determine:

Whether the given proteins show an expected epistatic interaction.

Introduction:

Sevenless and Yan proteins both play a significant role in the signaling pathway. They function during speciation of R7 cells in the development of the embryonic eye.

Summary Introduction

c.

To determine:

The method due to which two different null mutations in the R7 signaling pathway can evoke different mutant phenotypes.

Introduction:

When the phenotype of one gene depends on the presence of one or more modifier genes, this phenomenon is termed as epistasis. Null mutation makes a gene completely non-functional.

Summary Introduction

d.

To determine:

The reason due to which both Ras and Yan function downstream of Sevenless in the signaling pathway.

Introduction:

The epistasis of two genes that function in the same pathway relies on their order of action in the pathway. In the epistatic mutation, either the upstream gene products activate downstream gene products, or they reduce downstream gene products.

Summary Introduction

e.

To determine:

The mutant phenotype of the flies in the given question and whether yan^Dis expected to be epistatic to sev^- or Ras^g12V.

Introduction:

It is given that a researcher identifies flies with a constitutively active mutant allele of yan (yan^D) that is dominant. It expresses yan even in cells when the Sevenless pathway is in active state.

Expert Solution & Answer

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See solution

Answer 4

Question

Chapter 18, Problem 19P

Summary Introduction

a.

To describe:

The epistasis relationship between sev^- and yan- mutants.

Introduction:

It is given that the yan gene codes for a transcription factor. This transcription factor reduces R7 development in the five cells. These cells express Sevenless and are competent to become R7.

Summary Introduction

b.

To determine:

Whether the given proteins show an expected epistatic interaction.

Introduction:

Sevenless and Yan proteins both play a significant role in the signaling pathway. They function during speciation of R7 cells in the development of the embryonic eye.

Summary Introduction

c.

To determine:

The method due to which two different null mutations in the R7 signaling pathway can evoke different mutant phenotypes.

Introduction:

When the phenotype of one gene depends on the presence of one or more modifier genes, this phenomenon is termed as epistasis. Null mutation makes a gene completely non-functional.

Summary Introduction

d.

To determine:

The reason due to which both Ras and Yan function downstream of Sevenless in the signaling pathway.

Introduction:

The epistasis of two genes that function in the same pathway relies on their order of action in the pathway. In the epistatic mutation, either the upstream gene products activate downstream gene products, or they reduce downstream gene products.

Summary Introduction

e.

To determine:

The mutant phenotype of the flies in the given question and whether yan^Dis expected to be epistatic to sev^- or Ras^g12V.

Introduction:

It is given that a researcher identifies flies with a constitutively active mutant allele of yan (yan^D) that is dominant. It expresses yan even in cells when the Sevenless pathway is in active state.

Expert Solution & Answer

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See solution

Answer 5

Chapter 18, Problem 19P

Summary Introduction

a.

To describe:

The epistasis relationship between sev^- and yan- mutants.

Introduction:

It is given that the yan gene codes for a transcription factor. This transcription factor reduces R7 development in the five cells. These cells express Sevenless and are competent to become R7.

Summary Introduction

b.

To determine:

Whether the given proteins show an expected epistatic interaction.

Introduction:

Sevenless and Yan proteins both play a significant role in the signaling pathway. They function during speciation of R7 cells in the development of the embryonic eye.

Summary Introduction

c.

To determine:

The method due to which two different null mutations in the R7 signaling pathway can evoke different mutant phenotypes.

Introduction:

When the phenotype of one gene depends on the presence of one or more modifier genes, this phenomenon is termed as epistasis. Null mutation makes a gene completely non-functional.

Summary Introduction

d.

To determine:

The reason due to which both Ras and Yan function downstream of Sevenless in the signaling pathway.

Introduction:

The epistasis of two genes that function in the same pathway relies on their order of action in the pathway. In the epistatic mutation, either the upstream gene products activate downstream gene products, or they reduce downstream gene products.

Summary Introduction

e.

To determine:

The mutant phenotype of the flies in the given question and whether yan^Dis expected to be epistatic to sev^- or Ras^g12V.

Introduction:

It is given that a researcher identifies flies with a constitutively active mutant allele of yan (yan^D) that is dominant. It expresses yan even in cells when the Sevenless pathway is in active state.

Answer 6

Chapter 18, Problem 19P

Summary Introduction

a.

To describe:

The epistasis relationship between sev^- and yan- mutants.

Introduction:

It is given that the yan gene codes for a transcription factor. This transcription factor reduces R7 development in the five cells. These cells express Sevenless and are competent to become R7.

Answer 7

Chapter 18, Problem 19P

Summary Introduction

a.

To describe:

The epistasis relationship between sev^- and yan- mutants.

Introduction:

It is given that the yan gene codes for a transcription factor. This transcription factor reduces R7 development in the five cells. These cells express Sevenless and are competent to become R7.

Answer 8

Summary Introduction

b.

To determine:

Whether the given proteins show an expected epistatic interaction.

Introduction:

Sevenless and Yan proteins both play a significant role in the signaling pathway. They function during speciation of R7 cells in the development of the embryonic eye.

Answer 9

Summary Introduction

b.

To determine:

Whether the given proteins show an expected epistatic interaction.

Introduction:

Sevenless and Yan proteins both play a significant role in the signaling pathway. They function during speciation of R7 cells in the development of the embryonic eye.

Answer 10

Summary Introduction

c.

To determine:

The method due to which two different null mutations in the R7 signaling pathway can evoke different mutant phenotypes.

Introduction:

When the phenotype of one gene depends on the presence of one or more modifier genes, this phenomenon is termed as epistasis. Null mutation makes a gene completely non-functional.

Answer 11

Summary Introduction

c.

To determine:

The method due to which two different null mutations in the R7 signaling pathway can evoke different mutant phenotypes.

Introduction:

When the phenotype of one gene depends on the presence of one or more modifier genes, this phenomenon is termed as epistasis. Null mutation makes a gene completely non-functional.

Answer 12

Summary Introduction

d.

To determine:

The reason due to which both Ras and Yan function downstream of Sevenless in the signaling pathway.

Introduction:

The epistasis of two genes that function in the same pathway relies on their order of action in the pathway. In the epistatic mutation, either the upstream gene products activate downstream gene products, or they reduce downstream gene products.

Answer 13

Summary Introduction

d.

To determine:

The reason due to which both Ras and Yan function downstream of Sevenless in the signaling pathway.

Introduction:

The epistasis of two genes that function in the same pathway relies on their order of action in the pathway. In the epistatic mutation, either the upstream gene products activate downstream gene products, or they reduce downstream gene products.

Answer 14

Summary Introduction

e.

To determine:

The mutant phenotype of the flies in the given question and whether yan^Dis expected to be epistatic to sev^- or Ras^g12V.

Introduction:

It is given that a researcher identifies flies with a constitutively active mutant allele of yan (yan^D) that is dominant. It expresses yan even in cells when the Sevenless pathway is in active state.

Answer 15

Summary Introduction

e.

To determine:

The mutant phenotype of the flies in the given question and whether yan^Dis expected to be epistatic to sev^- or Ras^g12V.

Introduction:

It is given that a researcher identifies flies with a constitutively active mutant allele of yan (yan^D) that is dominant. It expresses yan even in cells when the Sevenless pathway is in active state.

Answer 16

Expert Solution & Answer

Answer 17

Expert Solution & Answer

Answer 18

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Answer 19

Ch. 18 - Match each of the terms in the left column to the...Ch. 18 - a. If you were interested in the role of a...Ch. 18 - Prob. 3P Ch. 18 - Flies homozygous for recessive null mutations in...Ch. 18 - In 1932, H. J. Muller suggested a genetic test to...Ch. 18 - a. Explain how you could use worms transformed...Ch. 18 - Prob. 7P Ch. 18 - Sevenless is an unusual receptor protein in that...Ch. 18 - Suppose that you generated flies containing a...Ch. 18 - Drosophila researchers have collected many strains...

a. To describe: The epistasis relationship between sev - and yan- mutants. Introduction: It is given that the yan gene codes for a transcription factor. This transcription factor reduces R7 development in the five cells. These cells express Sevenless and are competent to become R7.

Solution Summary: The author describes the epistasis relationship between sev - and yan- mutants. Sevenless and Yan proteins both play a significant role in the signaling pathway.

Videos

a.

To describe:

The epistasis relationship between sev^- and yan- mutants.

Introduction:

It is given that the yan gene codes for a transcription factor. This transcription factor reduces R7 development in the five cells. These cells express Sevenless and are competent to become R7.

b.

To determine:

Whether the given proteins show an expected epistatic interaction.

Introduction:

Sevenless and Yan proteins both play a significant role in the signaling pathway. They function during speciation of R7 cells in the development of the embryonic eye.

Want to see the full answer?

Chapter 18 Solutions

a. To describe: The epistasis relationship between sev - and yan- mutants. Introduction: It is given that the yan gene codes for a transcription factor. This transcription factor reduces R7 development in the five cells. These cells express Sevenless and are competent to become R7.

Solution Summary: The author describes the epistasis relationship between sev - and yan- mutants. Sevenless and Yan proteins both play a significant role in the signaling pathway.

Videos

a. To describe: The epistasis relationship between sev- and yan- mutants. Introduction: It is given that the yan gene codes for a transcription factor. This transcription factor reduces R7 development in the five cells. These cells express Sevenless and are competent to become R7.

b. To determine: Whether the given proteins show an expected epistatic interaction. Introduction: Sevenless and Yan proteins both play a significant role in the signaling pathway. They function during speciation of R7 cells in the development of the embryonic eye.

Want to see the full answer?

Chapter 18 Solutions

a.

To describe:

The epistasis relationship between sev^- and yan- mutants.

Introduction:

It is given that the yan gene codes for a transcription factor. This transcription factor reduces R7 development in the five cells. These cells express Sevenless and are competent to become R7.

b.

To determine:

Whether the given proteins show an expected epistatic interaction.

Introduction:

Sevenless and Yan proteins both play a significant role in the signaling pathway. They function during speciation of R7 cells in the development of the embryonic eye.