Concepts of Genetics (11th Edition)
Concepts of Genetics (11th Edition)
11th Edition
ISBN: 9780321948915
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Chapter 7, Problem 1NST
Summary Introduction

To contrast:

The mode of sexual differentiation of Bonellia viridis with that of the mammals. Also, suggest further experimentation to elucidate the sex-determination mechanism in B. viridis?

Introduction:

A biological system that determines the development of sexual characteristics of an organism is referred to as the sex-determination system. It refers to the environmental, hormonal, and specifically the genetic mechanisms that develop an organism as male or female. The development of phenotypic features of sex is referred to as sex differentiation.

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Explanation of Solution

The scheme of sex determination in mammals depends on the presence of the Y chromosome. The Y chromosomes are involved in producing males. The female proboscis in Bonellia viridis produces certain substances that trigger the physiological, morphological, and behavioral development patterns that produce males. In order to elucidate the mechanism, it could be an attempt to isolate and characterize the active substance. This is carried out by testing the different chemical fractions of the proboscis.

Usually, the mutant analysis provides clinical approaches to the process of development. The mutant which leads to the changes in female or male development might be isolated depending on the characteristics of the organism.

By using the micro-tissue transplantation, the anatomical centers of the embryo in response to the chemical cues of the female could be determined.

Conclusion

Sexual differentiation in mammals and Bonellia viridis depends on Y chromosomes and active substances respectively. The experimental approaches for elucidating the sex determinations mechanisms in Bonellia viridis is provided.

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Chapter 7 Solutions

Concepts of Genetics (11th Edition)

Ch. 7 - Prob. 4PDQCh. 7 - Distinguish between the concepts of sexual...Ch. 7 - Contrast the XX/XY and XX/X0 modes of sex...Ch. 7 - Describe the major difference between sex...Ch. 7 - How do mammals, including humans, solve the dosage...Ch. 7 - The phenotype of an early-stage human embryo is...Ch. 7 - What specific observations (evidence) support the...Ch. 7 - Describe how nondisjunction in human female...Ch. 7 - An insect species is discovered in which the...Ch. 7 - When cows have twin calves of unlike sex...Ch. 7 - An attached-X female fly, XXY (see the Insights...Ch. 7 - Assume that on rare occasions the attached X...Ch. 7 - It has been suggested that any male-determining...Ch. 7 - What is a Barr body, and where is it found in a...Ch. 7 - Indicate the expected number of Barr bodies in...Ch. 7 - Define the Lyon hypothesis.Ch. 7 - Can the Lyon hypothesis be tested in a human...Ch. 7 - Predict the potential effect of the Lyon...Ch. 7 - Cat breeders are aware that kittens expressing the...Ch. 7 - Prob. 23PDQCh. 7 - Prob. 24PDQCh. 7 - Prob. 25PDQCh. 7 - Prob. 26PDQCh. 7 - In mice, the Sry gene (see Section 7.2) is located...Ch. 7 - The genes encoding the red-and...Ch. 7 - What is the role of the enzyme aromatase in sexual...Ch. 7 - In the wasp Bracon hebetor, a form of...Ch. 7 - Prob. 31ESPCh. 7 - In mice, the X-linked dominant mutation Testicular...Ch. 7 - When the cloned cat Carbon Copy (CC) was born (see...Ch. 7 - Prob. 34ESPCh. 7 - In chickens, a key gene involved in sex...Ch. 7 - Prob. 36ESP
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