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The first part of this article described the evolution of crop varieties and their improvement by simple selection. This part discusses cross-breeding and the other techniques which underly most modern plant breeding programmes.
The purpose cf crossing is to generate new combinations of varietal characteristics. It does not create anything basically new. All the genetic "ingredients" of a new variety must be present in one or other of the parents.
Gladstones, John Sylvester
"The art and science of plant breeding,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 14
, Article 7.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol14/iss2/7