Abstract
LLEN (1960) reported briefly an aberration in the breeding behavior of a Astrain (C*) of variety 1 of Tetrahymena pyriformis. Her later studies (ALLEN 1963) established the genetic parameters of the aberration and lead to the conclusion that the total genome of the C* strain is systematically excluded at conjugation. Genomic exclusion does, however, involve a complete reorganization process and recombination of markers present in the normal parent if it is heterozygous. The occurrence of genomic exclusion in crosses to C* raises the possibility that similar aberrations may occur in other crosses and may bias breeding results in important ways. During the past few years many crosses have been made among group of strains of variety 1 in a study of the genetic basis for antigenic differences. Several of these crosses have provided indications of genetic anomalies similar to those reported by ALLEN. The purpose of this report is to document the occurrence of genetic aberrations and to indicate some of the methods whereby crosses may be screened.
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