Abstract
Cytological observations on several populations of Chrysanthemum carinatum revealed the presence of two types of plants: those regularly forming nine bivalents (homozygotes for the standard or the rearranged karyotype) and others showing a multiple of four chromosomes along with seven bivalents (interchange heterozygotes). These two chromosomal types were compared with regard to their reproductive potential and it was found that the interchange heterozygotes produced more flowers and seed per plant than the homozygotes. It is concluded that the preponderance of interchange heterozygotes in these populations is determined primarily by their superior reproductive fitness.
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