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1978•American Journal of BotanyRequires access

GENETICAL AND CYTOLOGICAL EVIDENCE FOR CHROMOSOMAL ELIMINATION IN A TRUE SLIME MOLD, DIDYMIUM IRIDIS

O’Neil Ray Collins, C. Dale Therrien, Donald A. Betterley

Open publisher page 23 citations

Abstract

In crosses involving a polyploid myxamoebal clone. CR 2‐25*, F1 plasmodia and myxamoebae display a variety of unexpected ploidy levels as indicated by nuclear DNA measurements. Genetic analyses of the F1 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.

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In crosses involving a polyploid myxamoebal clone. CR 2‐25*, F1 plasmodia and myxamoebae display a variety of unexpected ploidy levels as indicated by nuclear DNA measurements. Genetic analyses of the F1 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.

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Available abstract

In crosses involving a polyploid myxamoebal clone. CR 2‐25*, F1 plasmodia and myxamoebae display a variety of unexpected ploidy levels as indicated by nuclear DNA measurements. Genetic analyses of the F1 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.

Key concepts: Biology, Polyploid, Ploidy, Chromosome, Genetics, Evolutionary biology, Genetic algorithm, clone (Java method)

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GENETICAL AND CYTOLOGICAL EVIDENCE FOR CHROMOSOMAL ELIMINATION IN A TRUE SLIME MOLD, DIDYMIUM IRIDIS — Research Paper | ScholarLens