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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 18, Problem 11SQ
Textbook Problem
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Molecular clocks are based on comparisons of the number of ______ mutations between species.

  1. a. lethal
  2. b. neutral
  3. c. conservative
  4. d. nonconservative

Summary Introduction

Concept introduction: One of the most useful evolutionary concepts for applications is that of molecular clocks, in which a stretch of DNA-producing mutations at a rate is well enough to serve to calculate about how long ago two species diverged from a common ancestor. It compares the number of neutral mutations between species.

Explanation of Solution

Reason for correct answer: The concept of molecular clock was first proposed by Emile Zuckerkandl and Linus Pauling based on empirical observations, but in 1968, it received a theoretic backing by the biologist Moto Kimura, who developed the neutral theory of molecular evolution. He proved that the rate at which neutral mutations are fixed in a population is equivalent to the rate of appearance of new mutations in each manner of the population.

Option b. is given as “neutral”. Neutral mutations between species are based on molecular clocks.

Therefore, option b. is the correct answer.

Reason for incorrect answer:

Option a. is given as “lethal”...

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