Jump to ContentJump to Main Navigation
GenesisThe Evolution of Biology$
Users without a subscription are not able to see the full content.

Jan Sapp

Print publication date: 2003

Print ISBN-13: 9780195156195

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780195156195.001.0001

Show Summary Details
Page of

PRINTED FROM OXFORD SCHOLARSHIP ONLINE (www.oxfordscholarship.com). (c) Copyright Oxford University Press, 2020. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 17 February 2020

The Egg

The Egg

(p.103) 10 The Egg

Jan Sapp

Oxford University Press

This chapter discusses the diverging views of embryologists and geneticists about heredity and evolution. The two main reasons for this stemmed from research started in the 19th century. First, experimental embryologists were not concerned with adaptive changes to adult organisms. They were not concerned with the differences between individual varieties and species, but rather with the larger similarities and differences in the structural plans underlying different organismic types. They were interested in the form of the embryo and in the orderly changes during development — in how the parts of the organisms come together in space and time. Second, while geneticists and neo-Darwinian evolutionists maintained that changes in the nuclear chromosomal genes of eggs and sperm were the basis of evolution, many embryologists insisted that the cytoplasm of the egg played the primary role in heredity and development.

Keywords:   embryologists, geneticists, egg cytoplasm, maternal inheritance, cellular differentiation, cytoplasmic evolution, heredity

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 .