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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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Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 13, Problem 11SQ
Textbook Problem
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One gene that affects three traits is an example of ______.

  1. a. dominance
  2. b. codominance
  3. c. pleiotropy
  4. d. epistasis

Summary Introduction

Concept introduction: Alleles do not follow the laws of Mendelian inheritance. Some genes, such as pleiotropic genes do not follow the pattern of Mendelian inheritance. Pleiotropic genes control multiple traits. If the pleiotropic genes are mutated, all the traits are affected.

Explanation of Solution

Reason for correct answer:

A gene that affects three or more traits is known as pleiotropic genes. Pleiotropic genes are classified under non-Mendelian inheritance pattern.  The product of the pleiotropic gene has an effect on several traits.

Option c. is given as “pleiotropy” and since a single pleiotropic gene affects three traits, the correct answer is option c.

Reason for incorrect answer:

Option a. is given as, “dominance”.

The dominance is determined by crossing two true breeding parents. Dominance refers to the allele that masks the effect of another allele of the same gene in heterozygous condition...

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