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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 18, Problem 15SQ
Textbook Problem
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A mutation that alters the expression pattern of a _______ may lead to major differences in the adult form.

  1. a. derived character
  2. b. master regulator
  3. c. molecular clock
  4. d. homologous structure
  5. e. lineage
  6. f. all of the above

Summary Introduction

Concept introduction: The term “master regulator gene” was coined by Susumu Ohno over 30 years ago. The development of an organism from a fertilized egg from its embryonic   stage to adulthood requires the synchronized expression of sets of genes at the right times and in the proper places. Master regulator genes are the sets of genes that are responsible for the expression of normal body features of an adult one.

Explanation of Solution

Reason for correct answer: Every single character of an individual’s body is already assigned on definite genes. Those set of genes that are responsible for maintaining the basic body plan of an individual is known as master regulatory genes. If any kind of mutations in the sequence of master regulatory gene would generate serious impact on the physical appearance of the individual. Each part of the body has to come in the right way during birth, but a very simple mutation in the sequence of any of the genes of that set would produce a very harmful impact on the individual.

Option b. is given as “master regulator”. The set of genes responsible for maintaining the basic body plan of a human being is the master regulatory genes.

Therefore, option b. is the right answer.

Reasons for incorrect answer:

Option a. is given as “derived character”. It is a character that appears in some members of a taxonomic group but it would be absent in others. Therefore, option a...

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