a. To determine: The signal and the switch in the sex determination pathway of Drosophila . Introduction: It is given that sex-determination in Drosophila depends on the number of X chromosomes such that the ratio of X chromosomes to sets of autosomes is 1 in females and 0.5 in males.

Question

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Answer 1

Question

Chapter 18, Problem 20P

Summary Introduction

a.

To determine:

The signal and the switch in the sex determination pathway of Drosophila.

Introduction:

It is given that sex-determination in Drosophila depends on the number of X chromosomes such that the ratio of X chromosomes to sets of autosomes is 1 in females and 0.5 in males.

Summary Introduction

b.

To describe:

The tra^- and ix^- mutant phenotypes in XX flies and XY flies.

Introduction:

It is given that female flies have XX chromosomes and male flies have XY chromosomes in Drosophila. The tra and ix genes play an important role in sex determination of Drosophila.

Summary Introduction

c.

To determine:

The mutant phenotype of tra^- ix^- null double mutants and the mutation that would be epistatic.

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 the epistatic mutation does not play a role in the sex determination pathway as it does in the eye development pathway.

Introduction:

It is given that the epistatic mutation defined the downstream gene in the eye development pathway. This is not the case in the sex-determination pathway.

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Students have asked these similar questions

Which of the following applies to the female sex determination in Drosophila melanogaster fruit flies? (Mark all that apply) When the X:A ratio is 1.0, the SXL gene is transcribed during the early embryonic stages. The SXL protein inhibits the expression of female differentiaion genes The SXL protein promotes the correct splicing of the Tra pre-mRNA so that functional Tra protein is made. The presence of the SXL protein promotes the correct splicing of the SXL pre-mRNA during later embryonic stages to ensure to continuous production of SXL protein. The Tra protein will stimulate the expression of male-specific genes.

A mutation occurs in the Drosophila doublesex gene that prevents Tra from binding to the dsx RNA transcript. What would be the consequences of this mutation for Dsx protein expression in males? In females?

What would be the most likely effect of inhibiting the translation of hunchback mRNA throughout a Drosophila embryo?

Answer 2

Question

Chapter 18, Problem 20P

Summary Introduction

a.

To determine:

The signal and the switch in the sex determination pathway of Drosophila.

Introduction:

It is given that sex-determination in Drosophila depends on the number of X chromosomes such that the ratio of X chromosomes to sets of autosomes is 1 in females and 0.5 in males.

Summary Introduction

b.

To describe:

The tra^- and ix^- mutant phenotypes in XX flies and XY flies.

Introduction:

It is given that female flies have XX chromosomes and male flies have XY chromosomes in Drosophila. The tra and ix genes play an important role in sex determination of Drosophila.

Summary Introduction

c.

To determine:

The mutant phenotype of tra^- ix^- null double mutants and the mutation that would be epistatic.

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 the epistatic mutation does not play a role in the sex determination pathway as it does in the eye development pathway.

Introduction:

It is given that the epistatic mutation defined the downstream gene in the eye development pathway. This is not the case in the sex-determination pathway.

Expert Solution & Answer

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Answer 3

Question

Chapter 18, Problem 20P

Summary Introduction

a.

To determine:

The signal and the switch in the sex determination pathway of Drosophila.

Introduction:

It is given that sex-determination in Drosophila depends on the number of X chromosomes such that the ratio of X chromosomes to sets of autosomes is 1 in females and 0.5 in males.

Summary Introduction

b.

To describe:

The tra^- and ix^- mutant phenotypes in XX flies and XY flies.

Introduction:

It is given that female flies have XX chromosomes and male flies have XY chromosomes in Drosophila. The tra and ix genes play an important role in sex determination of Drosophila.

Summary Introduction

c.

To determine:

The mutant phenotype of tra^- ix^- null double mutants and the mutation that would be epistatic.

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 the epistatic mutation does not play a role in the sex determination pathway as it does in the eye development pathway.

Introduction:

It is given that the epistatic mutation defined the downstream gene in the eye development pathway. This is not the case in the sex-determination pathway.

Expert Solution & Answer

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Check out a sample textbook solution

See solution

Answer 4

Question

Chapter 18, Problem 20P

Summary Introduction

a.

To determine:

The signal and the switch in the sex determination pathway of Drosophila.

Introduction:

It is given that sex-determination in Drosophila depends on the number of X chromosomes such that the ratio of X chromosomes to sets of autosomes is 1 in females and 0.5 in males.

Summary Introduction

b.

To describe:

The tra^- and ix^- mutant phenotypes in XX flies and XY flies.

Introduction:

It is given that female flies have XX chromosomes and male flies have XY chromosomes in Drosophila. The tra and ix genes play an important role in sex determination of Drosophila.

Summary Introduction

c.

To determine:

The mutant phenotype of tra^- ix^- null double mutants and the mutation that would be epistatic.

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 the epistatic mutation does not play a role in the sex determination pathway as it does in the eye development pathway.

Introduction:

It is given that the epistatic mutation defined the downstream gene in the eye development pathway. This is not the case in the sex-determination pathway.

Expert Solution & Answer

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See solution

Answer 5

Chapter 18, Problem 20P

Summary Introduction

a.

To determine:

The signal and the switch in the sex determination pathway of Drosophila.

Introduction:

It is given that sex-determination in Drosophila depends on the number of X chromosomes such that the ratio of X chromosomes to sets of autosomes is 1 in females and 0.5 in males.

Summary Introduction

b.

To describe:

The tra^- and ix^- mutant phenotypes in XX flies and XY flies.

Introduction:

It is given that female flies have XX chromosomes and male flies have XY chromosomes in Drosophila. The tra and ix genes play an important role in sex determination of Drosophila.

Summary Introduction

c.

To determine:

The mutant phenotype of tra^- ix^- null double mutants and the mutation that would be epistatic.

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 the epistatic mutation does not play a role in the sex determination pathway as it does in the eye development pathway.

Introduction:

It is given that the epistatic mutation defined the downstream gene in the eye development pathway. This is not the case in the sex-determination pathway.

Answer 6

Chapter 18, Problem 20P

Summary Introduction

a.

To determine:

The signal and the switch in the sex determination pathway of Drosophila.

Introduction:

It is given that sex-determination in Drosophila depends on the number of X chromosomes such that the ratio of X chromosomes to sets of autosomes is 1 in females and 0.5 in males.

Answer 7

Chapter 18, Problem 20P

Summary Introduction

a.

To determine:

The signal and the switch in the sex determination pathway of Drosophila.

Introduction:

It is given that sex-determination in Drosophila depends on the number of X chromosomes such that the ratio of X chromosomes to sets of autosomes is 1 in females and 0.5 in males.

Answer 8

Summary Introduction

b.

To describe:

The tra^- and ix^- mutant phenotypes in XX flies and XY flies.

Introduction:

It is given that female flies have XX chromosomes and male flies have XY chromosomes in Drosophila. The tra and ix genes play an important role in sex determination of Drosophila.

Answer 9

Summary Introduction

b.

To describe:

The tra^- and ix^- mutant phenotypes in XX flies and XY flies.

Introduction:

It is given that female flies have XX chromosomes and male flies have XY chromosomes in Drosophila. The tra and ix genes play an important role in sex determination of Drosophila.

Answer 10

Summary Introduction

c.

To determine:

The mutant phenotype of tra^- ix^- null double mutants and the mutation that would be epistatic.

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 mutant phenotype of tra^- ix^- null double mutants and the mutation that would be epistatic.

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 the epistatic mutation does not play a role in the sex determination pathway as it does in the eye development pathway.

Introduction:

It is given that the epistatic mutation defined the downstream gene in the eye development pathway. This is not the case in the sex-determination pathway.

Answer 13

Summary Introduction

d.

To determine:

The reason due to which the epistatic mutation does not play a role in the sex determination pathway as it does in the eye development pathway.

Introduction:

It is given that the epistatic mutation defined the downstream gene in the eye development pathway. This is not the case in the sex-determination pathway.

Answer 14

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Answer 15

Expert Solution & Answer

Answer 16

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Answer 17

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 determine: The signal and the switch in the sex determination pathway of Drosophila . Introduction: It is given that sex-determination in Drosophila depends on the number of X chromosomes such that the ratio of X chromosomes to sets of autosomes is 1 in females and 0.5 in males.

Solution Summary: The author explains that sex-determination in Drosophila depends on the number of X chromosomes. The tra and ix genes play an important role in finding the female sexual characters in f

Videos

a.

To determine:

The signal and the switch in the sex determination pathway of Drosophila.

Introduction:

It is given that sex-determination in Drosophila depends on the number of X chromosomes such that the ratio of X chromosomes to sets of autosomes is 1 in females and 0.5 in males.

b.

To describe:

The tra^- and ix^- mutant phenotypes in XX flies and XY flies.

Introduction:

It is given that female flies have XX chromosomes and male flies have XY chromosomes in Drosophila. The tra and ix genes play an important role in sex determination of Drosophila.

Want to see the full answer?

Chapter 18 Solutions

a. To determine: The signal and the switch in the sex determination pathway of Drosophila . Introduction: It is given that sex-determination in Drosophila depends on the number of X chromosomes such that the ratio of X chromosomes to sets of autosomes is 1 in females and 0.5 in males.

Solution Summary: The author explains that sex-determination in Drosophila depends on the number of X chromosomes. The tra and ix genes play an important role in finding the female sexual characters in f

Videos

a. To determine: The signal and the switch in the sex determination pathway of Drosophila. Introduction: It is given that sex-determination in Drosophila depends on the number of X chromosomes such that the ratio of X chromosomes to sets of autosomes is 1 in females and 0.5 in males.

b. To describe: The tra- and ix- mutant phenotypes in XX flies and XY flies. Introduction: It is given that female flies have XX chromosomes and male flies have XY chromosomes in Drosophila. The tra and ix genes play an important role in sex determination of Drosophila.

Want to see the full answer?

Chapter 18 Solutions

a.

To determine:

The signal and the switch in the sex determination pathway of Drosophila.

Introduction:

It is given that sex-determination in Drosophila depends on the number of X chromosomes such that the ratio of X chromosomes to sets of autosomes is 1 in females and 0.5 in males.

b.

To describe:

The tra^- and ix^- mutant phenotypes in XX flies and XY flies.

Introduction:

It is given that female flies have XX chromosomes and male flies have XY chromosomes in Drosophila. The tra and ix genes play an important role in sex determination of Drosophila.