Jump to ContentJump to Main Navigation
Darwinian DetectivesRevealing the Natural History of Genes and Genomes$
Users without a subscription are not able to see the full content.

Norman A. Johnson

Print publication date: 2007

Print ISBN-13: 9780195306750

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780195306750.001.0001

Show Summary Details
Page of

PRINTED FROM OXFORD SCHOLARSHIP ONLINE (www.oxfordscholarship.com). (c) Copyright Oxford University Press, 2019. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 20 October 2019

Size Matters

Size Matters

Toward Understanding the Natural History of Genomes

(p.167) 12 Size Matters
Darwinian Detectives

Norman A. Johnson

Oxford University Press

Genome size varies widely among different organisms, and is not very closely correlated with complexity of the organism. In species with large genomes, most of the DNA does not code for genes. This chapter explores the “selfish DNA” hypothesis for genome size. It also discusses vertebrate cases of small genome size (e.g., pufferfish) and extraordinarily large genome size (e.g., species of salamanders). A consequence of the huge genome in these salamanders is that their brains are less complex. Michael Lynch has proposed that much of the variation in genome size may be explained by variation in effective population size. The chapter concludes with a discussion of how genome size may be related to extinction risk and hence, conservation biology.

Keywords:   conservation biology, effective population size, extinction risk, genome size, selfish DNA, pufferfish, salamanders

Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.

Please, subscribe or login to access full text content.

If you think you should have access to this title, please contact your librarian.

To troubleshoot, please check our FAQs , and if you can't find the answer there, please contact us .