Inheritance

Abstract

Based on genetic data, all heritable cases of male sterility may be categorized as either genic, cytoplasmic or gene-cytoplasmic. Table I summarizes their known examples as occurring within a species whereas cases metwith among the interspecific hybrids are listed in Table 2. It is customary to denote the presence or absence of a plasm factor by + and — signs respectively. In columns of nuclear inheritance (Table I), the number of dominant and recessive genes controlling the male-sterile character are indicated. It will be noted that in some cases, there was reported an indication of genetic control, although exact information as to the number or kind of factor is missing. Since the genetic information in most instances appears either preliminary or identical, tabulation is considered all that may be necessary for our purpose here.