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GENETICAL AND CYTOLOGICAL EVIDENCE FOR CHROMOSOMAL ELIMINATION IN A TRUE SLIME MOLD, DIDYMIUM IRIDIS
Author(s) -
Collins O'Neil R.,
Therrien C. D.,
Betterley Donald A.
Publication year - 1978
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1978.tb06123.x
Subject(s) - biology , polyploid , ploidy , chromosome , genetics , evolutionary biology , genetic algorithm , clone (java method) , dna , gene
In crosses involving a polyploid myxamoebal clone. CR 2‐25*, F 1 plasmodia and myxamoebae display a variety of unexpected ploidy levels as indicated by nuclear DNA measurements. Genetic analyses of the F 1 generations reveal either complete elimination of certain genetic markers or greatly skewed segregation ratios. On the basis of these two kinds of evidence, it is assumed that chromosome elimination occurs at some stage (or stages) following karyogamy between parental nuclei. The possible significance of polyploidy in relation to myxomycete speciation and evolution is discussed.