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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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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 13, Problem 13SQ
Textbook Problem
39 views

_______ in a trait is indicated by a bell curve.

  1. 1. a An epigenetic effect
  2. 2. b. Pleiotropy
  3. 3. c. Incomplete dominance
  4. 4. d. Continuous variation

Summary Introduction

Concept introduction: Normal distribution or Gaussian distribution in probability is the continuous probability distribution that always yields a bell-shaped curve when plotted in a graph. Continuous variation is normal distribution.

Explanation of Solution

Reasons for correct statement:

Epistasis results in continuous variation. In continuous variation, several genes control a single trait. The entire phenotypes are categorized for a particular trait. Then the number of individuals corresponding to each phenotype category is noted down. A bar chart or graph line is drawn. If the obtained graph is bell-shaped, then the set of genes that control the particular trait can be grouped as continuous variation.

Option d. is given as “Continuous variation”.

As continuous variation in a trait gives bell-shaped curve, option d. is correct.

Reasons for the incorrect statements:

Option a. is given as “An epigenetic effect”.

Epigenetic effect is the change in the trait when the genes are affected by the factors other DNA sequence...

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