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J Embryol Exp Morphol 4, 161-166 (1956)
Published by The Company of Biologists 1956
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Factors Affecting Vertebral Variation in Mice

3. Maternal Effects in Reciprocal Crosses

Anne McLaren and Donald Michie1

Department of Zoology and Comparative Anatomy, University College London

1 Authors' address: Royal Veterinary College, Royal College Street, London, N.W.1, U.K.

Received for publication 2 August 1955.

SUMMARY

It has long been realized that the biological properties and potentialities of the new-born animal are not conditioned solely by the chromosomal endowment received from its parents. Other means whereby a parental imprint may be stamped upon pre-natal development include the extra-chromosomal constituents of the gametes and, in species characterized by internal fertilization, the biological environment acting during post-zygotic existence within the mother's body.

In mammals the post-zygotic connexion between the mother and her unborn young is intimate and prolonged. Yet the number of recorded instances of ‘maternal effects’ in mammals is not large, while cases which have received detailed study are very few.

We are concerned to analyse maternal effects upon a skeletal character—the number of lumbar vertebrae—for which natural variation exists both in laboratory (Green, 1941) and in wild (Weber, 1950) populations of mice.

The facts which provided the basis for our investigation are the following.


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© The Company of Biologists Ltd 1956